This journal provides immediate access to some articles. Volume 37(5); May 1951 Biochemistry The Interaction of Mucoprotein With Soluble Collagen; An Electron Microscope Study PMCID: PMC1063355 Chemistry Atomic Coordinates and Structure Factors for Two Helical Configurations of Polypeptide Chains PMCID: PMC1063348 The Structure of Synthetic Polypeptides PMCID: PMC1063349 The Pleated Sheet, A New Layer Configuration of Polypeptide Chains PMCID: PMC1063350 The Structure of Feather Rachis Keratin PMCID: PMC1063351 The Structure of Hair, Muscle, and Related Proteins PMCID: PMC1063352 The Structure of Fibrous Proteins of the Collagen-Gelatin Group PMCID: PMC1063353 The Polypeptide-Chain Configuration in Hbmoglobin and Other Globular Proteins PMCID: PMC1063354 An Hypothesis of Protein Synthesis Potentiated by Citric Acid PMCID: PMC1063356 Genetics An Adenine Requirement in a Strain of Drosophila PMCID: PMC1063357 Absence of Cytosine in Bacteriophage T2 PMCID: PMC1063358 Mathematics On the Generating Functions of Totally Positive Sequences PMCID: PMC1063359 Cohomology Theory of Abelian Groups and Homotopy Theory III PMCID: PMC1063360 Generalized Riemann Spaces PMCID: PMC1063361 Weierstrass Transforms of Positive Functions PMCID: PMC1063362 Psychology The Interconversion of Audible and Visible Patterns as a Basis for Research in the Perception of Speech PMCID: PMC1063363 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||