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(A and B) Loading of TMRM was enhanced by 10 μM verapamil in both PTs and DTs (A) but not by cimetidine (B). Data are means ± SE signal per ×40 objective field from three medullary ray regions (randomly selected using the bright-field setting) per slice from a total of three (verapamil) or four (cimetidine) slices per experiment (*P < 0.03).
