Key points are not available for this paper at this time.
As a step in the investigation of the structure and function of ribosomes several laboratories initiated chemical studies on the ribosomal protein of E. coli (Waller, 1964; Traut, 1966; Traut, Moore, Delius, Noller, and Tissières, 1967; Kaltschmidt, Dzionara, Donner, and Wittmann, 1967; Möller and Chrambach, 1967; Fogel and Sypherd, 1968; Otaka, Itoh, and Osawa, 1968; Craven, Voynow, Hardy, and Kurland, 1969). The major result of these studies was the demonstration that there were a large number of proteins which could be separated by standard techniques. Other laboratories undertook investigations emphasizing functional properties of ribosomal proteins and elegantly showed their functional heterogeneity (Hosokawa, Fujimura, and Nomura, 1966; Staehelin and Meselson, 1966; Nomura, Mizushima, Ozaki, Traub, and Lowry, this volume; Staehelin, Maglott, and Monro, this volume).
Traut et al. (Wed,) studied this question.