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From 50 to 60 different proteins and three different RNA molecules are organized into the 30 S and 50 S ribosome particles (see Kurland, 1960; Rosset and Monier, 1963; and the following papers in this volume: Kurland, Voynow, Hardy, Randall, and Lutter; Traut, Delius, Ahmad-Zadeh, Bickle, Pearson, and Tissières; Sypherd, O'Neil, and Taylor).
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Apirion et al. (1969) studied this question.
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