Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 2zhgA 4rayA 4rayB 2zhgA 100 35 32 4rayA 33 100 98 4rayB 31 98 100 FOLD SIMILARITY (Z-SCORE) 2zhgA 4rayA 4rayB 2zhgA 19.7 1.3 1.9 4rayA 1.8 23.9 17.4 4rayB 1.8 17.4 23.6