Table 1

Percentage amino acid identity of bH1 versus four sodium channel isoforms

Isoform	N	DI	L1	DII	L2	DIII	L3	DIV	C
Na_v1.5 (rH1)	92	95	86	97	80	97	100	98	93
Na_v1.5 (hH1)	92	95	86	95	81	97	100	96	92
Na_v1.2 (α2)	56	72	38	77	46	71	90	77	63
Na_v1.4 (μ1)	58	67	41	80	29	80	86	80	71

rH1, rat heart (Swissprot P15389); hH1, human heart (SwissprotQ14524); α2, rat brain 2 (Swissprot P04775); μl, rat skeletal muscle (Swissprot P15390). N, amino terminus; DI to DIV, domains one to four; C, carboxy terminus; L1 to L3, intracellular loops linking the four domains.