| Summary: | Ribonucleic acid (RNA) of tobacco mosaic virus controls the specificity of viral proteins synthesized in the cells of tobacco leaves (Fraenkel-Conrat et al, 1957a) and in a bacterial cell-free system (Taugita et al, 1962). In bacteria, three types of RNA are now recognized, transfer (Berg and Ofengand, 1958), ribosomal (Schachman et al, 1952), and a so-called "messenger” or “rapidly labelled" RNA (Volkin and Astrachan, 1956). The “messenger” fraction is thought to control the specificity of proteins synthesized in bacterial cells (Nomura et al, 1960; Brenner et al, 1961; Gros et al, 1961a; Jacob and Monod, 1961), although direct proof for this claim has not yet been obtained.
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