Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1f5vA 1ylqA 1f5vA 100 11 1ylqA 10 100 FOLD SIMILARITY (Z-SCORE) 1f5vA 1ylqA 1f5vA 37.3 0.4 1ylqA 1.4 21.7