Profiles of MC4100 [λ Cmr Δ(SR)] induction. (A) Cells harboring pKB1 (□), pS105 (▪), pNHS105 (◊), or pCHS105 (⧫) were induced at time zero and monitored for 1.5 h. (B) Cells harboring pKB1 (□), pS105 (▪), pS105H94 (⧫), pS105H94a52v (◊), or pS107H94m3l (⊙) allele.