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(A) Po versus cytosolic [Ca2+] for high (black) and low (gray) luminal Ca2+. The lines are binding curves. (B) Po versus applied voltage for high (black) and low (gray) luminal Ca2+. Parentheses: number of recordings. Also listed are calculated Ca2+ currents. Cytosolic [Ca2+] is 10 μM. Other [Ca2+] are also independent of potential (data not shown). Details of the Po analysis, binding curves, and Ca2+ currents are in the Supporting Materials and Methods.
