Summary. The presence of diaminopimelic acid (m-DAP) in strains of and other species as well as in unidentified strains of was investigated by thin-layer chromatography. Strains of and all contained m-DAP as did the subspecies and of . Strains of and similar black pigment-producing butyrate-positive isolates showed heterogeneity. Asaccharoly-tic strains were DAP negative, whereas two strains fermenting glucose were positive. Some of the non-pigmented propionate-negative and butyrate-negative unidentified strains also contained DAP. The consistent finding of m-DAP in strains of , and indicates that DAP detection might be of value in the identification of these species.


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