Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2zcwA 3tuoA 3tuoB 2zcwA 100 17 8 3tuoA 26 100 99 3tuoB 25 99 100 FOLD SIMILARITY (Z-SCORE) 2zcwA 3tuoA 3tuoB 2zcwA 35.7 0 0 3tuoA 0 23.1 19.8 3tuoB 0 19.8 22.9