Abstract
A spontaneous mutant of Escherichia coli K12 C600 was isolated which is mucoid as a result of overproduction of an extracellular polysaccharide. This strain also forms filaments, is sensitive to ultraviolet irradiation, and has its genetic lesion closely linked to the lac gene. Its phenotype and map position are analogous to the lon mutation (long form). The exopolysaccharide contains fucose, glucose, galactose, and may contain glucuronic acid, but the molar ratios of these sugars differ from those previously reported.
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