Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3k4tA 3k4tB 4g6qA 3k4tA 100 99 0 3k4tB 99 100 0 4g6qA 0 0 100 FOLD SIMILARITY (Z-SCORE) 3k4tA 3k4tB 4g6qA 3k4tA 7.4 6 0 3k4tB 6 7.5 0 4g6qA 0 0 30.3