Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2y7eA 2y7eB 3wx4A 2y7eA 100 99 15 2y7eB 99 100 12 3wx4A 3 9 100 FOLD SIMILARITY (Z-SCORE) 2y7eA 2y7eB 3wx4A 2y7eA 54.4 52 0 2y7eB 52 55.1 0 3wx4A 0 0 20.2