This journal provides immediate access to some articles. Volume 66(2); June 1970 Biological Sciences: Biochemistry Posttranscriptional Control of Tyrosine Aminotransferase Synthesis by Insulin PMCID: PMC283057 Elevation of Guanosine 3′,5′-Cyclic Phosphate in Rat Heart after Perfusion with Acetylcholine PMCID: PMC283058 Bacillus subtilis Mutant Altered in Spore Morphology and in RNA Polymerase Activity PMCID: PMC283059 Electrophoretically Homogeneous Anti-DNP Antibodies with Restricted Isoelectric Points Elicited in Mice by Immunization with the Antigen Papain-S-DNPL PMCID: PMC283060 Electron Microscopy of Kinetoplastic DNA from Trypanosoma mega PMCID: PMC283061 Synthesis of Immunoglobulin Heavy and Light Chains by the Free Ribosomes of a Mouse Plasma Cell Tumor PMCID: PMC283062 Membrane Structure: Lipid-Protein Interactions in Microsomal Membranes PMCID: PMC283063 The Dynamics of Life, II. The Steady-State Theory of Mutation Rates PMCID: PMC283064 A Source for the Special Catalytic Power of Enzymes: Orbital Steering PMCID: PMC283065 Neurally Mediated Increase in Dopamine-β-Hydroxylase Activity PMCID: PMC283066 Interconvertible Forms of Glycogen Phosphorylase in Neurospora crassa PMCID: PMC283067 Rapid Purification and the Immunological Specificity of Mammalian Microtubular Paracrystals Possessing an ATPase Activity PMCID: PMC283068 Isolation, Characterization, and Location of a Donor-Acceptor Unit from Cross-Linked Fibrin PMCID: PMC283069 Cyclic AMP Receptor Protein of E. coli: Its Role in the Synthesis of Inducible Enzymes PMCID: PMC283070 Coding and Conformational Properties of Oligonucleotides Modified with the Carcinogen N-2-Acetylaminofluorene PMCID: PMC283071 Synthesis of Acid Mucopolysaccharides by Glial Tumor Cells in Tissue Culture PMCID: PMC283072 Identification of L-Methionine-S-Sulfoximine as the Convulsant Isomer of Methionine Sulfoximine PMCID: PMC283073 Structure and Function of E. coli Formylmethionyl tRNA, I. Effect of Modification of Pyrimidine Residues on Aminoacyl Synthetase Recognition PMCID: PMC283074 Glucose-6-Phosphate Dehydrogenase and Neurospora Morphology PMCID: PMC283075 Studies on the Formation of Transfer Ribonucleic Acid-Ribosome Complexes, XII. Phenylalanyl-Oligonucleotide Binding to E. coli Ribosomes: Necessity for a Free Amino Group PMCID: PMC283076 13-Desmethyl Rhodopsin and 13-Desmethyl Isorhodopsin: Visual Pigment Analogues PMCID: PMC283077 Qβ-Replicase and E. coli Transcriptase: Requirements for Substrate Selection as Revealed by a Study of Base Analogs PMCID: PMC283078 Studies of the Mechanism of Anthranilate Synthase Reaction PMCID: PMC283079 Effect of Lactate on Collagen Proline Hydroxylase Activity in Cultured L-929 Fibroblasts PMCID: PMC283080 Implications of Heavy Chain Disease Protein Sequences for Multiple Gene Theories of Immunoglobulin Synthesis PMCID: PMC283081 Ability of Nonenzymic Nitration or Acetylation of E. coli Glutamine Synthetase to Produce Effects Analogous to Enzymic Adenylylation PMCID: PMC283082 Ribonucleic Acid Synthesis of Vesicular Stomatitis Virus, II. An RNA Polymerase in the Virion PMCID: PMC283083 Biological Sciences: Genetics Synchronous Reinitiation of Chromosome Replication in E. coli B/r after Nalidixic Acid Treatment PMCID: PMC283053 Temporal Phenotypic Heterogeneity as a Substrate for Selection PMCID: PMC283054 Isolation of Temperature-Sensitive Mutants of L-Cells PMCID: PMC283055 Genetic Evolution of Bacteriophage, II. Physical Length of the Homologous Region in a Hybrid between Serologically and Morphologically Unrelated Phages PMCID: PMC283056 Biological Sciences: Medical Sciences Globoid Cell Leucodystrophy (Krabbe's Disease): Deficiency of Galactocerebroside β-Galactosidase PMCID: PMC283044 Biological Sciences: Microbiology A Cell-Associated Factor Essential for Formation of an Infectious Form of Rous Sarcoma Virus PMCID: PMC283046 Linkage between the Poly-L-Lysine Gene and the Locus Controlling the Major Histocompatibility Antigens in Strain 2 Guinea Pigs PMCID: PMC283047 DNA Complementary to Viral RNA in Leukemic Cells Induced by Avian Myeloblastosis Virus PMCID: PMC283048 Evidence for Control of Synthesis of the Variable Regions of the Heavy Chains of Immunoglobulins G and M by the Same Gene PMCID: PMC283049 Leukemia Viruses Associated with Mouse Myeloma Cells PMCID: PMC283050 Genetic Control of the Cell-Division Cycle in Yeast, I. Detection of Mutants PMCID: PMC283051 Biological Sciences: Physiology Behavioral Activation of Rats during Intraventricular Infusion of Norepinephrine PMCID: PMC283042 Neurogenesis and Morphogenesis in the Cerebellar Cortex PMCID: PMC283043 Biological Sciences: Psychology Some Evidence for the Involvement of Adrenergic Sites in the Memory Trace PMCID: PMC283045 Effects of Combined Frontal and Temporal Lesions on Learned Behaviors in Rhesus Monkeys PMCID: PMC283084 Biological Sciences: Zoology Effects of Cytochalasin B upon Microfilaments Involved in Morphogenesis of Salivary Epithelium PMCID: PMC283052 Physical Sciences: Astronomy Excitation of Metastable Levels in Low Density Nebular Plasmas: [SII] and [ArIV] PMCID: PMC283041 Physical Sciences: Chemistry Active Site of α-Chymotrypsin Activation by Association-Desolvation PMCID: PMC283036 Is the Breakdown of the Born-Oppenheimer Approximation Responsible for Internal Conversion in Large Molecules? PMCID: PMC283037 Physical Sciences: Mathematics Characteristic Classes and Weyl Tensor: Applications to General Relativity PMCID: PMC283038 A Singular Abstract Cauchy Problem PMCID: PMC283039 Theory of a Class of Locally Convex Vector Lattices Which Include the Lebesgue Spaces PMCID: PMC283040 Corrections TRANS-SPECIES RESCUE OF DEFECTIVE GENOMES OF MURINE SARCOMA VIRUS FROM HAMSTER TUMOR CELLS WITH HELPER FELINE LEUKEMIA VIRUS PMCID: PMC283085 Corrects: Trans-Species Rescue of Defective Genomes of Murine Sarcoma Virus from Hamster Tumor Cells with Helper Feline Leukemia Virus. Proc Natl Acad Sci U S A. 1970 January; 65(1): 81–87. TOPOLOGICAL RELATIONSHIP OF PROPHAGE λ TO THE BACTERIAL CHROMOSOME IN LYSOGENIC CELLS PMCID: PMC283086 Corrects: Topological Relationship of Prophage λ to the Bacterial Chromosome in Lysogenic Cells. Proc Natl Acad Sci U S A. 1970 January; 65(1): 200–205. 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