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1531. The Structure of Collagen

1533. On Protein Synthesis

1534. The Present Position of the Coding Problem

1535. DNA

1536. The Two Languages of Biology

1537. The Molecular Structure of Polyadenylic Acid

1538. The Theory of Mutagenesis [Editorial letter]

1539. General Nature of the Genetic Code for Proteins

1540. Towards the Genetic Code