FIG. 2.

Effect of spermidine on cell growth of E. coli CAG2242 transformed with pMW119 encoding putative transporters. Cells were cultured in the presence and absence of 12 mM spermidine, and cell growth was monitored by measuring the A₅₄₀. ▴, cell growth of E. coli CAG2242/pMW119 without spermidine; •, cell growth of E. coli CAG2242/pMW119 with 12 mM spermidine. Data were shown by dividing the transporters into families. Symbols shown in the figure indicate the genes transformed with pMW119. As a control, cell growth of E. coli CAG2242/pUCmdtJI (⧫) was monitored. Values are the averages of duplicate determinations.