Truncated Abi proteins rescue the growth defect of abiA-null cells. (a, b) Growth curves corresponding to transformants cultured on a petri dish (a) or in shaking suspension (b). A cell count was performed every 12 h, and the fold increase was calculated and plotted. Error bars indicate SEMs. WT, full-length Abi; ΔNt, N-terminally truncated Abi; ΔCt1 and ΔCt2, C-terminally truncated Abi as shown in Fig. 1c; ΔAbiΔ, combination of both N-terminally and C-terminally truncated Abi; Null, HSPC300-GFP-only vector.