Abstract
Work of the past few years revealed a series of identifiable steps in the pathway from free amino acid to completed protein, and exciting developments are occurring in several separate research salients, with promise in particular of clarification of the relationship between RNA and amino acid coding. A recurrent theme of the present lecture is that there appears to be a separate species of RNA esterified to each amino acid, with this uniqueness residing in the primary sequence of mononucleotide residues and possibly in features of the secondary structure that the order of major and minor base constituents impose on this intramolecularly hydrogen-bonded macromolecule.

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