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FAB-MS of purified GPL core. GPL core of serotype 4 showed a main peak at an m/z of 1,027, corresponding to the (M-H)- ion in negative-ion mode (A) and an m/z of 1,051 corresponding to the (M+Na)+ in positive-ion mode (B). Based on these results, the molecular weight of GPL core of MAC serotype 4 was calculated to be 1,028.
