Analyses were made to determine the amino acid composition of the cell-wall proteins of Salmonella pullorum, S. senftenberg 775W, S. derby, and Escherichia coli. These proteins consist of the usual 18 amino acids found in most proteins with diaminopimelic acid in addition. Quantitative determination of these amino acids showed that their amounts were similar.
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Howe et al. (1965) studied this question.
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