Summary: Attempts have been made to use the protein composition of streptomycetes as a criterion in their classification. By using polyacrylamide gel electrophoresis, negatively charged proteins in extracts of various streptomycete strains were separated. For each strain a distinctive pattern of protein bands was obtained. Protein bands were mapped for a number of strains, including several each of and Maps were compared and contrasted: in general there was more similarity between strains within one species than between strains of different species. Although the polyacrylamide gel technique cannot yet be used as a major criterion in classification, it can serve, in conjunction with other criteria, as an aid in streptomycete taxonomy.


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