Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2chcA 2chcC 4myyA 4myyB 2chcA 100 95 0 0 2chcC 95 100 0 0 4myyA 0 0 100 92 4myyB 0 2 92 100 FOLD SIMILARITY (Z-SCORE) 2chcA 2chcC 4myyA 4myyB 2chcA 33.3 30.6 0 0 2chcC 30.6 33.1 0 0 4myyA 0 0 14.9 10.8 4myyB 0 0.7 10.8 15