Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2ch7A 2ch7B 2yvaA 2ch7A 100 0 0 2ch7B 0 0 0 2yvaA 0 0 100 FOLD SIMILARITY (Z-SCORE) 2ch7A 2ch7B 2yvaA 2ch7A 22.8 0 0 2ch7B 0 0 0 2yvaA 0 0 38.6