Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3hrnA 3op9A 4d7kA 5d60C 3hrnA 100 6 7 3 3op9A 0 100 31 0 4d7kA 0 33 100 0 5d60C 5 3 0 100 FOLD SIMILARITY (Z-SCORE) 3hrnA 3op9A 4d7kA 5d60C 3hrnA 7.5 0 1.1 6.3 3op9A 0 17.4 1 0 4d7kA 0 1 50.7 0 5d60C 6.5 0 0 7.4