Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3ibmA 3ibmB 3uoaB 3ibmA 100 98 53 3ibmB 98 100 18 3uoaB 44 21 100 FOLD SIMILARITY (Z-SCORE) 3ibmA 3ibmB 3uoaB 3ibmA 29.7 26 0 3ibmB 26 29.3 0 3uoaB 0 0 60.5