Sequence Similarity : Homologous sequences (>30%) SEQUENCE SIMILARITY (%) 3d9xA 3ntnA 3ntnB 4usxA 3d9xA 100 76 74 100 3ntnA 37 100 97 33 3ntnB 39 97 100 35 4usxA 49 96 100 100 FOLD SIMILARITY (Z-SCORE) 3d9xA 3ntnA 3ntnB 4usxA 3d9xA 12.7 1.9 1.8 1.7 3ntnA 0 30.1 28.4 2.8 3ntnB 0.3 28.4 30.8 2.2 4usxA 1.7 8.3 5.3 21.1