Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2p9xA 3a1yA 2p9xA 100 0 3a1yA 0 100 FOLD SIMILARITY (Z-SCORE) 2p9xA 3a1yA 2p9xA 23.8 0 3a1yA 0 14.2