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Basic-region sequence alignment of the bHLH MyoD (mouse) and E47 (human) proteins, MASH1 (mouse), and the bHLH-LZ Max (mouse) protein. Amino acids are given in one-letter code; the numbering is according to full-length mouse MyoD. The conserved yet conformationally nonuniform arginines at the 111 positions are boxed; the residues at position 114, which likely determine the conformation of Arg-111, are shaded.
