Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 1kkcA 1kkcX 3kdrA 3kdrC 1kkcA 100 99 67 68 1kkcX 99 100 65 68 3kdrA 67 66 100 99 3kdrC 69 69 99 100 FOLD SIMILARITY (Z-SCORE) 1kkcA 1kkcX 3kdrA 3kdrC 1kkcA 37.5 35.8 1.2 1.4 1kkcX 35.8 37.6 1.2 1.4 3kdrA 1.3 1.2 38.2 34.7 3kdrC 1.5 1.5 34.7 38.6