| | This journal provides immediate access to some articles. Inaugural Article Cultural mosaics and mental models of nature Megan Bang, Douglas L. Medin, and Scott Atran Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13868–13874. Published online 2007 August 22. doi: 10.1073/pnas.0706627104.PMCID: PMC1955807 This Week in PNAS Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13853–13854. doi: 10.1073/iti3507104.PMCID: PMC1955808 Commentaries Jammed traffic impedes parasite growth Eric Beitz Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13855–13856. Published online 2007 August 20. doi: 10.1073/pnas.0706632104.PMCID: PMC1955814 HIV protease inhibitors and nuclear lamin processing: Getting the right bells and whistles Steven Gerard Clarke Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13857–13858. Published online 2007 August 20. doi: 10.1073/pnas.0706529104.PMCID: PMC1955769 Transgenic animal bioreactors: A new line of defense against chemical weapons? Xiangzhong Yang and Mark G. Carter Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13859–13860. Published online 2007 August 22. doi: 10.1073/pnas.0706163104.PMCID: PMC1955779 Review Human and animal cognition: Continuity and discontinuity David Premack Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13861–13867. Published online 2007 August 23. doi: 10.1073/pnas.0706147104.PMCID: PMC1955772 Physical Sciences Applied Mathematics Spatial reduction algorithm for atmospheric chemical transport models Y. Rastigejev, M. P. Brenner, and D. J. Jacob Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13875–13880. Published online 2007 August 22. doi: 10.1073/pnas.0705649104.PMCID: PMC1955770 Chemistry The synthesis and in vitro testing of a zinc-activated MRI contrast agent Jody L. Major, Giacomo Parigi, Claudio Luchinat, and Thomas J. Meade Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13881–13886. Published online 2007 August 27. doi: 10.1073/pnas.0706247104.PMCID: PMC1955783 Evolution of a fluorinated green fluorescent protein Tae Hyeon Yoo, A. James Link, and David A. Tirrell Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13887–13890. Published online 2007 August 23. doi: 10.1073/pnas.0701904104.PMCID: PMC1955812 Engineering Microfluidic system for on-chip high-throughput whole-animal sorting and screening at subcellular resolution Christopher B. Rohde, Fei Zeng, Ricardo Gonzalez-Rubio, Matthew Angel, and Mehmet Fatih Yanik Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13891–13895. Published online 2007 August 21. doi: 10.1073/pnas.0706513104.PMCID: PMC1955819 Mathematics New results of intersection numbers on moduli spaces of curves Kefeng Liu and Hao Xu Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13896–13900. Published online 2007 August 16. doi: 10.1073/pnas.0705910104.PMCID: PMC1955784 Biological Sciences Agricultural Sciences Synergism of Bacillus thuringiensis toxins by a fragment of a toxin-binding cadherin Jiang Chen, Gang Hua, Juan Luis Jurat-Fuentes, Mohd Amir Abdullah, and Michael J. Adang Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13901–13906. Published online 2007 August 27. doi: 10.1073/pnas.0706011104.PMCID: PMC1955780 Applied Biological Sciences Metabolic engineering of a genetic selection system with tunable stringency Andreas C. Kleeb, Maryam Hansson Edalat, Marianne Gamper, Johannes Haugstetter, Lars Giger, Martin Neuenschwander, Peter Kast, and Donald Hilvert Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13907–13912. Published online 2007 August 22. doi: 10.1073/pnas.0705379104.PMCID: PMC1955800 Quantitative assessment of protein function prediction from metagenomics shotgun sequences E. D. Harrington, A. H. Singh, T. Doerks, I. Letunic, C. von Mering, L. J. Jensen, J. Raes, and P. Bork Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13913–13918. Published online 2007 August 23. doi: 10.1073/pnas.0702636104.PMCID: PMC1955820 Biochemistry Identification and characterization of a selenoprotein family containing a diselenide bond in a redox motif Valentina A. Shchedrina, Sergey V. Novoselov, Mikalai Yu. Malinouski, and Vadim N. Gladyshev Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13919–13924. Published online 2007 August 22. doi: 10.1073/pnas.0703448104.PMCID: PMC1955791 DNA transposition target immunity and the determinants of the MuB distribution patterns on DNA Xin Tan, Michiyo Mizuuchi, and Kiyoshi Mizuuchi Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13925–13929. Published online 2007 August 20. doi: 10.1073/pnas.0706564104.PMCID: PMC1950340 Structural insights into the interaction of the evolutionarily conserved ZPR1 domain tandem with eukaryotic EF1A, receptors, and SMN complexes Ashwini K. Mishra, Laxman Gangwani, Roger J. Davis, and David G. Lambright Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13930–13935. Published online 2007 August 17. doi: 10.1073/pnas.0704915104.PMCID: PMC1955815 High-throughput fluorescent-based optimization of eukaryotic membrane protein overexpression and purification in Saccharomyces cerevisiae Simon Newstead, Hyun Kim, Gunnar von Heijne, So Iwata, and David Drew Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13936–13941. Published online 2007 August 20. doi: 10.1073/pnas.0704546104.PMCID: PMC1955786 Crystal structure of the incretin-bound extracellular domain of a G protein-coupled receptor Christoph Parthier, Martin Kleinschmidt, Piotr Neumann, Rainer Rudolph, Susanne Manhart, Dagmar Schlenzig, Jörg Fanghänel, Jens-Ulrich Rahfeld, Hans-Ulrich Demuth, and Milton T. Stubbs Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13942–13947. Published online 2007 August 21. doi: 10.1073/pnas.0706404104.PMCID: PMC1955799 Biophysics How gene order is influenced by the biophysics of transcription regulation Grigory Kolesov, Zeba Wunderlich, Olga N. Laikova, Mikhail S. Gelfand, and Leonid A. Mirny Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13948–13953. Published online 2007 August 20. doi: 10.1073/pnas.0700672104.PMCID: PMC1955771 From the Cover: NS3 helicase actively separates RNA strands and senses sequence barriers ahead of the opening fork Wei Cheng, Sophie Dumont, Ignacio Tinoco, Jr., and Carlos Bustamante Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13954–13959. Published online 2007 August 20. doi: 10.1073/pnas.0702315104.PMCID: PMC1955789 Thermodynamically reengineering the listerial invasion complex InlA/E-cadherin Thomas Wollert, Dirk W. Heinz, and Wolf-Dieter Schubert Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13960–13965. Published online 2007 August 22. doi: 10.1073/pnas.0702199104.PMCID: PMC1955803 Cell Biology Collagen-binding proteoglycan fibromodulin can determine stroma matrix structure and fluid balance in experimental carcinoma Åke Oldberg, Sebastian Kalamajski, Alexei V. Salnikov, Linda Stuhr, Matthias Mörgelin, Rolf K. Reed, Nils-Erik Heldin, and Kristofer Rubin Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13966–13971. Published online 2007 August 22. doi: 10.1073/pnas.0702014104.PMCID: PMC1955775 An 11-amino acid β-hairpin loop in the cytoplasmic domain of band 3 is responsible for ankyrin binding in mouse erythrocytes Marko Stefanovic, Nicholas O. Markham, Erin M. Parry, Lisa J. Garrett-Beal, Amanda P. Cline, Patrick G. Gallagher, Philip S. Low, and David M. Bodine Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13972–13977. Published online 2007 August 22. doi: 10.1073/pnas.0706266104.PMCID: PMC1950715 Inositol 1,3,4,5-tetrakisphosphate controls proapoptotic Bim gene expression and survival in B cells Yoann Maréchal, Xavier Pesesse, Yonghui Jia, Valérie Pouillon, David Pérez-Morga, Julien Daniel, Shozo Izui, Peter J. Cullen, Oberdan Leo, Hongbo R. Luo, Christophe Erneux, and Stéphane Schurmans Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13978–13983. Published online 2007 August 20. doi: 10.1073/pnas.0704312104.PMCID: PMC1955816 SOX9 is a key player in ultraviolet B-induced melanocyte differentiation and pigmentation Thierry Passeron, Julio C. Valencia, Corine Bertolotto, Toshihiko Hoashi, Elodie Le Pape, Kaoruko Takahashi, Robert Ballotti, and Vincent J. Hearing Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13984–13989. Published online 2007 August 16. doi: 10.1073/pnas.0705117104.PMCID: PMC1955778 Developmental Biology A βPix–Pak2a signaling pathway regulates cerebral vascular stability in zebrafish Jing Liu, Sherri D. Fraser, Patrick W. Faloon, Evvi Lynn Rollins, Johannes Vom Berg, Olivera Starovic-Subota, Angie L. Laliberte, Jau-Nian Chen, Fabrizio C. Serluca, and Sarah J. Childs Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13990–13995. Published online 2007 June 15. doi: 10.1073/pnas.0700825104.PMCID: PMC1955796 From the Cover: pak2a mutations cause cerebral hemorrhage in redhead zebrafish David A. Buchner, Fengyun Su, Jennifer S. Yamaoka, Makoto Kamei, Jordan A. Shavit, Linda K. Barthel, Beth McGee, Julio D. Amigo, Seongcheol Kim, Andrew W. Hanosh, Pudur Jagadeeswaran, Daniel Goldman, Nathan D. Lawson, Pamela A. Raymond, Brant M. Weinstein, David Ginsburg, and Susan E. Lyons Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13996–14001. Published online 2007 August 22. doi: 10.1073/pnas.0700947104.PMCID: PMC1955825 Cortical dysplasia and skull defects in mice with a Foxc1 allele reveal the role of meningeal differentiation in regulating cortical development Konstantinos Zarbalis, Julie A. Siegenthaler, Youngshik Choe, Scott R. May, Andrew S. Peterson, and Samuel J. Pleasure Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14002–14007. Published online 2007 August 21. doi: 10.1073/pnas.0702618104.PMCID: PMC1955817 Vertebrate heart growth is regulated by functional antagonism between Gridlock and Gata5 Haibo Jia, Isabelle N. King, Sameer S. Chopra, Haiyan Wan, Terri T. Ni, Charlie Jiang, Xiaoqun Guan, Sam Wells, Deepak Srivastava, and Tao P. Zhong Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14008–14013. Published online 2007 August 21. doi: 10.1073/pnas.0702240104.PMCID: PMC1955785 Environmental Sciences Increases in nitrogen uptake rather than nitrogen-use efficiency support higher rates of temperate forest productivity under elevated CO2 Adrien C. Finzi, Richard J. Norby, Carlo Calfapietra, Anne Gallet-Budynek, Birgit Gielen, William E. Holmes, Marcel R. Hoosbeek, Colleen M. Iversen, Robert B. Jackson, Mark E. Kubiske, Joanne Ledford, Marion Liberloo, Ram Oren, Andrea Polle, Seth Pritchard, Donald R. Zak, William H. Schlesinger, and Reinhart Ceulemans Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14014–14019. Published online 2007 August 20. doi: 10.1073/pnas.0706518104.PMCID: PMC1955801 Evolution From the Cover: A diapause pathway underlies the gyne phenotype in Polistes wasps, revealing an evolutionary route to caste-containing insect societies James H. Hunt, Bart J. Kensinger, Jessica A. Kossuth, Michael T. Henshaw, Kari Norberg, Florian Wolschin, and Gro V. Amdam Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14020–14025. Published online 2007 August 17. doi: 10.1073/pnas.0705660104.PMCID: PMC1955821 Diploid apomicts of the Boechera holboellii complex display large-scale chromosome substitutions and aberrant chromosomes Laksana Kantama, Timothy F. Sharbel, M. Eric Schranz, Thomas Mitchell-Olds, Sacco de Vries, and Hans de Jong Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14026–14031. Published online 2007 August 17. doi: 10.1073/pnas.0706647104.PMCID: PMC1955788 Genetics Microfluidic system for on-chip high-throughput whole-animal sorting and screening at subcellular resolution Christopher B. Rohde, Fei Zeng, Ricardo Gonzalez-Rubio, Matthew Angel, and Mehmet Fatih Yanik Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13891–13895. Published online 2007 August 21. doi: 10.1073/pnas.0706513104.PMCID: PMC1955819 Oxidation of the sugar moiety of DNA by ionizing radiation or bleomycin could induce the formation of a cluster DNA lesion Peggy Regulus, Benoit Duroux, Pierre-Alain Bayle, Alain Favier, Jean Cadet, and Jean-Luc Ravanat Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14032–14037. Published online 2007 August 22. doi: 10.1073/pnas.0706044104.PMCID: PMC1955805 Protection of telomeres by a conserved Stn1–Ten1 complex Victoria Martín, Li-Lin Du, Sophie Rozenzhak, and Paul Russell Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14038–14043. Published online 2007 August 22. doi: 10.1073/pnas.0705497104.PMCID: PMC1955774 Protection against telomeric position effects by the chicken cHS4 β-globin insulator Héctor Rincón-Arano, Mayra Furlan-Magaril, and Félix Recillas-Targa Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14044–14049. Published online 2007 August 21. doi: 10.1073/pnas.0704999104.PMCID: PMC1955792 Immunology The Atg5–Atg12 conjugate associates with innate antiviral immune responses Nao Jounai, Fumihiko Takeshita, Kouji Kobiyama, Asako Sawano, Atsushi Miyawaki, Ke-Qin Xin, Ken J. Ishii, Taro Kawai, Shizuo Akira, Koichi Suzuki, and Kenji Okuda Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14050–14055. Published online 2007 August 20. doi: 10.1073/pnas.0704014104.PMCID: PMC1955809 Medical Sciences Identification of IRS-1 Ser-1101 as a target of S6K1 in nutrient- and obesity-induced insulin resistance Frédéric Tremblay, Sophie Brûlé, Sung Hee Um, Yu Li, Kohei Masuda, Michael Roden, Xiao Jian Sun, Michael Krebs, Roberto D. Polakiewicz, George Thomas, and André Marette Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14056–14061. Published online 2007 August 20. doi: 10.1073/pnas.0706517104.PMCID: PMC1950339 Disruption of CXCR4 enhances osteoclastogenesis and tumor growth in bone Angela C. Hirbe, Jessica Rubin, Özge Uluçkan, Elizabeth A. Morgan, Mark C. Eagleton, Julie L. Prior, David Piwnica-Worms, and Katherine N. Weilbaecher Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14062–14067. Published online 2007 August 22. doi: 10.1073/pnas.0705203104.PMCID: PMC1955795 Human cardiac stem cells Claudia Bearzi, Marcello Rota, Toru Hosoda, Jochen Tillmanns, Angelo Nascimbene, Antonella De Angelis, Saori Yasuzawa-Amano, Irina Trofimova, Robert W. Siggins, Nicole LeCapitaine, Stefano Cascapera, Antonio P. Beltrami, David A. D'Alessandro, Elias Zias, Federico Quaini, Konrad Urbanek, Robert E. Michler, Roberto Bolli, Jan Kajstura, Annarosa Leri, and Piero Anversa Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14068–14073. Published online 2007 August 20. doi: 10.1073/pnas.0706760104.PMCID: PMC1955818 Genetic inhibition of cardiac ERK1/2 promotes stress-induced apoptosis and heart failure but has no effect on hypertrophy in vivo Nicole H. Purcell, Benjamin J. Wilkins, Allen York, Marc K. Saba-El-Leil, Sylvain Meloche, Jeffrey Robbins, and Jeffery D. Molkentin Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14074–14079. Published online 2007 August 20. doi: 10.1073/pnas.0610906104.PMCID: PMC1955824 Apoptotic cells protect mice from autoimmune inflammation by the induction of regulatory B cells M. Gray, K. Miles, D. Salter, D. Gray, and J. Savill Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14080–14085. Published online 2007 August 21. doi: 10.1073/pnas.0700326104.PMCID: PMC1955797 Microbiology From the Cover: Aberrant infection and persistence of varicella-zoster virus in human dorsal root ganglia in vivo in the absence of glycoprotein I Leigh Zerboni, Mike Reichelt, Carol D. Jones, James L. Zehnder, Hideki Ito, and Ann M. Arvin Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14086–14091. Published online 2007 August 20. doi: 10.1073/pnas.0706023104.PMCID: PMC1955823 Searching for species in haloarchaea R. Thane Papke, Olga Zhaxybayeva, Edward J. Feil, Katrin Sommerfeld, Denise Muise, and W. Ford Doolittle Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14092–14097. Published online 2007 August 21. doi: 10.1073/pnas.0706358104.PMCID: PMC1955782 Heteroresistance to penicillin in Streptococcus pneumoniae Brigitte Morand and Kathrin Mühlemann Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14098–14103. Published online 2007 August 17. doi: 10.1073/pnas.0702377104.PMCID: PMC1950099 Neuroscience Intravenous immunoglobulin (IVIG) protects the brain against experimental stroke by preventing complement-mediated neuronal cell death Thiruma V. Arumugam, Sung-Chun Tang, Justin D. Lathia, Aiwu Cheng, Mohamed R. Mughal, Srinivasulu Chigurupati, Tim Magnus, Sic L. Chan, Dong-Gyu Jo, Xin Ouyang, David P. Fairlie, Daniel N. Granger, Alexander Vortmeyer, Milan Basta, and Mark P. Mattson Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14104–14109. Published online 2007 August 21. doi: 10.1073/pnas.0700506104.PMCID: PMC1955802 From the Cover: A Drosophila gustatory receptor required for the responses to sucrose, glucose, and maltose identified by mRNA tagging Yuchen Jiao, Seok Jun Moon, and Craig Montell Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14110–14115. Published online 2007 August 22. doi: 10.1073/pnas.0702421104.PMCID: PMC1955822 Ionotropic glutamate-like receptor δ2 binds d-serine and glycine Peter Naur, Kasper B. Hansen, Anders S. Kristensen, Shashank M. Dravid, Darryl S. Pickering, Lars Olsen, Bente Vestergaard, Jan Egebjerg, Michael Gajhede, Stephen F. Traynelis, and Jette S. Kastrup Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14116–14121. Published online 2007 August 21. doi: 10.1073/pnas.0703718104.PMCID: PMC1955790 Characterization of the role of the Synaptotagmin family as calcium sensors in facilitation and asynchronous neurotransmitter release Sudipta Saraswati, Bill Adolfsen, and J. Troy Littleton Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14122–14127. Published online 2007 August 20. doi: 10.1073/pnas.0706711104.PMCID: PMC1955806 Genetic modulation of cognitive flexibility and socioemotional behavior in rhesus monkeys Alicia Izquierdo, Timothy K. Newman, J. Dee Higley, and Elisabeth A. Murray Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14128–14133. Published online 2007 August 21. doi: 10.1073/pnas.0706583104.PMCID: PMC1950559 Binomial parameters differ across neocortical layers and with different classes of connections in adult rat and cat neocortex Antoine Brémaud, David C. West, and Alex M. Thomson Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14134–14139. Published online 2007 August 16. doi: 10.1073/pnas.0705661104.PMCID: PMC1949494 Amyolid precursor protein mediates presynaptic localization and activity of the high-affinity choline transporter Baiping Wang, Li Yang, Zilai Wang, and Hui Zheng Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14140–14145. Published online 2007 August 20. doi: 10.1073/pnas.0704070104.PMCID: PMC1955810 Norepinephrine enables the induction of associative long-term potentiation at thalamo-amygdala synapses Keith Tully, Yan Li, Evgeny Tsvetkov, and Vadim Y. Bolshakov Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14146–14150. Published online 2007 August 20. doi: 10.1073/pnas.0704621104.PMCID: PMC1955781 Resolving vesicle fusion from lysis to monitor calcium-triggered lysosomal exocytosis in astrocytes Jyoti K. Jaiswal, Marina Fix, Takahiro Takano, Maiken Nedergaard, and Sanford M. Simon Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14151–14156. Published online 2007 August 21. doi: 10.1073/pnas.0704935104.PMCID: PMC1955787 Soluble misfolded subfractions of mutant superoxide dismutase-1s are enriched in spinal cords throughout life in murine ALS models Per Zetterström, Heather G. Stewart, Daniel Bergemalm, P. Andreas Jonsson, Karin S. Graffmo, Peter M. Andersen, Thomas Brännström, Mikael Oliveberg, and Stefan L. Marklund Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14157–14162. Published online 2007 August 21. doi: 10.1073/pnas.0700477104.PMCID: PMC1955813 Cytochrome c oxidase deficiency in neurons decreases both oxidative stress and amyloid formation in a mouse model of Alzheimer's disease Hirokazu Fukui, Francisca Diaz, Sofia Garcia, and Carlos T. Moraes Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14163–14168. Published online 2007 August 21. doi: 10.1073/pnas.0705738104.PMCID: PMC1955773 Plant Biology Mendel's green cotyledon gene encodes a positive regulator of the chlorophyll-degrading pathway Yutaka Sato, Ryouhei Morita, Minoru Nishimura, Hiroyasu Yamaguchi, and Makoto Kusaba Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 14169–14174. Published online 2007 August 20. doi: 10.1073/pnas.0705521104.PMCID: PMC1955798 Social Sciences Psychology Cultural mosaics and mental models of nature Megan Bang, Douglas L. Medin, and Scott Atran Proc Natl Acad Sci U S A. 2007 August 28; 104(35): 13868–13874. Published online 2007 August 22. doi: 10.1073/pnas.0706627104.PMCID: PMC1955807 |