Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1qbzA 1qbzB 2sivC 1qbzA 100 90 3 1qbzB 90 100 0 2sivC 8 6 100 FOLD SIMILARITY (Z-SCORE) 1qbzA 1qbzB 2sivC 1qbzA 14.6 13 3.8 1qbzB 13 15.6 0 2sivC 3.8 2.4 5.8