Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 2yyyA 3r9pA 2yyyA 100 80 3r9pA 81 100 FOLD SIMILARITY (Z-SCORE) 2yyyA 3r9pA 2yyyA 61.6 1.8 3r9pA 2.6 65.5