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7541. The Structure of Collagen

7543. On Protein Synthesis

7544. The Present Position of the Coding Problem

7545. DNA

7546. The Two Languages of Biology

7547. The Molecular Structure of Polyadenylic Acid

7548. The Theory of Mutagenesis [Editorial letter]

7549. General Nature of the Genetic Code for Proteins

7550. Towards the Genetic Code