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Amino acid residues at the “a” and “d” positions of the heptad repeat of the coiled-coil domain of chick CMP. According to Harbury et al. (1993), the heptad repeat with Leu residues at the d position would form a double helix coiled coil, and the one with β-branched residues such as Val and Ile at the d position would form a triple-helix coiled-coil. The chick CMP contains two Leu and two β-branched residues at the d position. n, number of heptad repeats.
