Abstract
Antisera prepared against the purified transaldolases of 5 Bifidobacterium spp. were used to establish natural relationships among the 21 species that presently comprise this genus. The degree of phylogenetic relatedness among the respective members of this genus was estimated from the results of qualitative and quantitative immunological procedures in which the enzymes served as an evolutionary marker. The results are presented in the form of a phylogenetic dendrogram.

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