Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4pv2B 4ytdA 4ytdB 4pv2B 100 0 0 4ytdA 0 100 33 4ytdB 0 33 100 FOLD SIMILARITY (Z-SCORE) 4pv2B 4ytdA 4ytdB 4pv2B 30.1 0 0 4ytdA 0 8.5 7.4 4ytdB 0 7.4 8.7