Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3na2A 6f8sA 6f8sC 3na2A 100 0 0 6f8sA 0 100 99 6f8sC 0 99 100 FOLD SIMILARITY (Z-SCORE) 3na2A 6f8sA 6f8sC 3na2A 29.1 0 0 6f8sA 0 19.1 18.1 6f8sC 0 18.1 19.2