Fig. 3

Growth curve of intracellular protease-deficient strains. CK, pWB980/BS1A751, wild-type (WT), pWB980-AIO6BS/BS1A751; ∆ymfH,∆yrrN, ∆ywpE, ∆tepA: intracellular protease-deficient mutants harboring the expression vector pWB980-AIO6BS