FIG. 5.

Efflux of Na⁺ from cells of VK6 and VK6/mrpF in the presence or absence of cholate. The cells were starved and loaded with ²²NaCl, as described in Materials and Methods, in the absence (open symbols) or presence (solid symbols) of 0.08% (wt/vol) cholate. Efflux of Na⁺ from VK6 (○, ●) and VK6/mrpF (▵, ▴) was assayed in the presence of glucose, as in Fig. 3.