Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 3p3yA 3rvyA 3p3yA 100 0 3rvyA 0 100 FOLD SIMILARITY (Z-SCORE) 3p3yA 3rvyA 3p3yA 52.5 0 3rvyA 0 27.7