Fusion protein amino acids 808-874 (cytoplasmic loop between repeat II and III) of rat Cav1.2 (also known as Voltage-dependent L-type calcium channel subunit alpha-1C, CACNA1C, CACH2, CACN2, CACNL1A1, CCHL1A1, Brain class C and MELC-CC, accession number Q5S007) Mouse: 100% identity (67/67 amino acids identical) Human: 86% identity (58/67 amino acids identical) <50% identity with other Cav1 channels