Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1s7iA 1vr6A 1yq5A 1s7iA 100 13 27 1vr6A 13 100 57 1yq5A 33 71 100 FOLD SIMILARITY (Z-SCORE) 1s7iA 1vr6A 1yq5A 1s7iA 22.8 3.9 0.4 1vr6A 3.8 56.7 0 1yq5A 0.3 0 31.6