Figure 2.

Schematic representations of the expressed α₁ subunits. Thinner lines denote regions having amino acid sequence corresponding to the rabbit cardiac α_1C subunit (Mikami et al., 1989); thicker lines denote regions corresponding to the rabbit skeletal muscle α_1S subunit (Tanabe et al., 1987). The amino acid composition of α_1C−3′del and construction of its cDNA has been previously described; the final five amino acid residues from the COOH terminus of α_1C (GVSSL) are retained in α_1C−3′del (Zong et al., 1994). The amino acid composition and cDNA construction of CSk1, CSk2, CSk3, and CSk4 are described in Tanabe et al. (1990b). The compositions of CSk5 and CSk8 and the constructions of their cDNAs are described in materials and methods.