Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2y3mA 2y3mB 3caiA 2y3mA 100 95 59 2y3mB 96 100 32 3caiA 70 27 100 FOLD SIMILARITY (Z-SCORE) 2y3mA 2y3mB 3caiA 2y3mA 20.9 18 0 2y3mB 18 20.8 0 3caiA 0 0 72.6