Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1yq8A 3gwmA 4usxA 1yq8A 100 60 54 3gwmA 59 100 0 4usxA 34 0 100 FOLD SIMILARITY (Z-SCORE) 1yq8A 3gwmA 4usxA 1yq8A 31.5 0 0 3gwmA 0.3 28.5 0.4 4usxA 0 0.4 21.1