An antiserum against the purified glucose-6-phosphate dehydrogenase (EC (G-6-P-DH) of NCDO 768 has been prepared. Cross-reactions were observed with extracts of other strains of , comprising named strains of , and . Cross-reactions were not obtained with . The groups of identical specificity and their order of decreasing similarity toward the homologous enzyme were determined, and the results are consistent with those obtained previously with another G-6-P-DH antiserum from NCDO 546. Thus, except for , many strains of comprising multiple (three or more) species might be considered as phenotypically diverse but genetically rather uniform in their line of descent from a common ancestor.


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