16S rRNA parsimony tree. Maximum parsimony tree showing relationships between bacterial isolates from this study, other bacteria known from bees, and representative members of the major bacterial clades. Tree based on an alignment of 850 nt from the 5' end of the 16S rRNA gene. Bacteria from this study shown as MB##, followed by site of collection. Isolates that showed inhibition of the honey bee pathogen P. larvae shown in bold type. Names in bold represent those isolates that inhibited and isolates followed by an asterick did not inhibit consistently.