Comparison of the amino acid sequences of MTG16a, MTG16b, MTG8b, and MTGR1. Identical residues shared by more than two proteins are shaded. Horizontal bars above the sequences indicate the positions of NHR1, NHR2, NHR3, and the zinc finger domain. Horizontal wavy lines also indicate the positions of PST region. The cysteine residues of the zinc finger motifs are marked by an asterisk below the sequence. The amino acid sequences of the two proteins are identical to one another after the 127th leucine of MTG16a and after the 41st leucine of MTG16b.