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β-Galactosidase activities from a ybtP : : lacZ reporter in Y. pestis strains. Activities of a plasmid-encoded ybtP : : lacZ reporter (pEUYbtP) in the control (Ybt+) and indicated mutant strains. Endogenous synthesis of Ybt or a Ybt-like molecule is responsible for transcriptional activation. Strains: Ybt+, KIM6+; ybtS : : kan, KIM6-2070.1; Δy2336, KIM6-2126; ybtS : : kan Δy2336, KIM6-2070.2.
