SUMMARY: By a simple chromatographic technique with filter-paper disks the distribution of glutamic acid decarboxylase in the family Enterobacteriaceae was surveyed. The decarboxylase occurred irregularly among 230 strains belonging to this family. The test for glutamic acid decarboxylase may prove to be of value in the classification of organisms related to the genus , in the classification of paracolon types and in the identification of sub-groups within the genera and .


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