Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 4i42A 4i42C 4i4zA 4i42A 100 99 87 4i42C 99 100 87 4i4zA 87 87 100 FOLD SIMILARITY (Z-SCORE) 4i42A 4i42C 4i4zA 4i42A 46.9 44.8 40.3 4i42C 44.8 46.9 40.4 4i4zA 40.3 40.4 47.2