Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3nx3A 3nx3B 4v1gA 3nx3A 100 98 8 3nx3B 98 100 0 4v1gA 15 16 100 FOLD SIMILARITY (Z-SCORE) 3nx3A 3nx3B 4v1gA 3nx3A 71.4 64.5 2 3nx3B 64.5 69.7 1.7 4v1gA 0 0 14.9