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. 1999 Feb;181(4):1196–1202. doi: 10.1128/jb.181.4.1196-1202.1999

FIG. 4.

FIG. 4

Exchange-mediated efflux of intracellular radioactivity. IPTG-induced E. coli cells expressing npt1Ct were preloaded by incubation with [α-32P]ATP at 25 μM. After removal of external radioactivity, cells were resuspended in phosphate buffer with or without 1 mM AMP, ADP, or ATP.