(A) Representative Ba2+ currents (Top) and current-voltage relationships (Bottom) of CaV1.2 channels expressed in tsA-201 cells by co-transfection of the indicated cDNAs encoding CaV1.2Δ1800, distal C-terminus (DCT), AKAP15, and 5 μM Forskolin (FSK). (B) Representative Ba2+ currents (Top) and current-voltage relationships (Bottom) of CaV1.2 channels expressed in tsA-201 cells by co-transfection of the indicated cDNAs encoding CaV1.2Δ1800, distal C-terminus (DCT), AKAP15, and 5 μM Forskolin (FSK) with wild-type CaV1.2Δ1800 and mutants S1700A, T1704A, and S1700A/T1704A. Mean±SEM; significance determined by ANOVA.