Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4rr2A 5nkqA 5nkqB 4rr2A 100 0 0 5nkqA 0 100 98 5nkqB 0 98 100 FOLD SIMILARITY (Z-SCORE) 4rr2A 5nkqA 5nkqB 4rr2A 64 0.7 0.7 5nkqA 0 24.8 23.1 5nkqB 0 23.1 24.5