Table 1.

Photoactivity measurements of PR proteoliposomes.

PR version	n	∆pH	SD
PR-wt*	6	−0.11	±0.02
PR-N221C*	3	−0.07	±0.02
PR∆18	3	−0.15	±0.03
PR∆18-C176S	5	−0.17	±0.03
PR∆18-N221C	3	−0.09	±0.01
PR∆18-C176S-N221C	16	−0.09	±0.02

*From reference¹⁰.

n: number of independent experiments, each experiment in triplicate.

ΔpH: average of maximal pH changes.

SD: standard deviation.