Western blot analysis of meningococcal whole-cell lysates. Bacteria at either the exponential (lanes 2 and 4) or the stationary (lanes 3 and 5) phase were harvested and lysed by sonication. The protein concentrations were determined, and equal amounts of protein were loaded. The Western blots were incubated with preabsorbed mouse polyclonal antisera to recombinant meningococcal GalE protein. Lane 1, purified recombinant GalE; lanes 2 and 3, N. meningitidis NMB; lanes 4 and 5, N. meningitidis MA-1; lane 6, MA-1 galE. Solid arrowheads denote the band specific to GalE.