Fig. 2. Alignment of the fast/developmental and IIM MYH genes. To construct a sequence phylogeny, the amino acid sequences of the human embryonic, IIA, IIX, IIB, IIM, perinatal, cardiac and ß and MYH13 MYH gene sequence were aligned using Clustal X (Thompson et al., 1997). The high level and continuity of sequence conservation among striated muscle myosins made it possible to use low penalties for gap introduction and extension without introducing spurious gaps. Low values were necessary to properly align both the N- and C-terminal sequences. ^*, colon and stop mark positions with identical, strongly or weakly conserved amino acids, respectively. Color indicates the chemical characteristics of amino acids: light blue, hydrophobic; purple, acidic; dark blue, H and Y; green, N, Q, S and T; dark brown, R, K and C; light brown, G; yellow, P. A white background marks non-conserved residues.

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