Abstract
Review of the literature on the lipopolysac-charide of Enterobacteriaceae leads us to the following conclusions: (1) The structure of the peripheral portion, i. e. “O side chains,” varies extensively within each “genus.” (2) Although the structure of the central portion, i. e. “R core,” tends to be rather similar within each “genus,” there are cases of two Escherichia coli strains which synthesize the same O side chains and, at the same time, different R cores.

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