This journal provides immediate access to some articles. Volume 270(1522); July 7, 2003 Towards the delineation of the ancestral eutherian genome organization: comparative genome maps of human and the African elephant (Loxodonta africana) generated by chromosome painting. PMCID: PMC1691379 Killer-sensitive coexistence in metapopulations of micro-organisms. PMCID: PMC1691387 Habitat preference and the marine-speciation paradox. PMCID: PMC1691380 Evolutionary models of phylogenetic trees. PMCID: PMC1691382 | ||