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Proton pump activity of WT GR, GR/Rh 223-252, GR/Rh 223-253, GR/Rh 225-251, GR/Rh 225-252, GR E132Q, and GR/Rh 225-252 + E132Q (solid lines). After the addition of CCCP, all light-induced decreases in pH disappeared (dotted lines).
