Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2j3lA 3m4pA 4fdbA 2j3lA 100 84 21 3m4pA 80 100 38 4fdbA 63 38 100 FOLD SIMILARITY (Z-SCORE) 2j3lA 3m4pA 4fdbA 2j3lA 60.5 12.8 0 3m4pA 13.3 58.2 7.7 4fdbA 0 7.7 21.2