LPS profiles of polyP-deficient cells of Pseudomonas sp . B4. Equal numbers of Pseudomonas sp. B4 polyP-deficient and control cell samples were loaded in each lane and analysed by 12% (w/v) PAGE by using a Tricine-SDS buffer system. LPS from Salmonella serovars Typhi was used as LPS control (lane M). The arrow indicates the change seen in a band of the inner core. RU: repetitive units.