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pH dependence of photoactivation of Ca2+ indicators. Change of absorbance in the Ca2+-free state (a–c) and Ca2+-bound state (d–f) with violet light (405 nm) illumination as a function of pH for: (a, d) CAR-GECO1; (b, e) R-GECO1.2; (c, f) O-GECO1.
