The protein sequence alignment of the MRF family.

<p><b>A</b>) The domain differences of the MRFs gene family. <b>B</b>) The sequence alignment of the HLH domains of representative MRFs from nematodes to humans. <b>C</b>) The sequence alignment of the C-terminal sequences of representative vertebrate MRFs. The amino acid sequence SXXTSPXSNCSDGM and SSLDCLSXIVXRIT are conserved in the MYF5 domains of <i>MyoD</i> and <i>Myf5</i>.