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Tricine gel electrophoresis of partially purified LPS of strains MC58 and 2120 and their derivatives grown in the absence or presence of CMP-NANA. Lane B, LPS of wild-type strain B1940 shown as a control (27); lanes 1 and 2, wild-type strains; lanes 3 and 4, lst mutant; lane 5, galE mutant. Double bands result from the different migrations of sialylated LPS (upper band) and unsialylated LPS (lower band) in Tricine gels (27).
