Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2qihA 3ntnA 3ntnB 2qihA 100 82 80 3ntnA 100 100 97 3ntnB 0 97 100 FOLD SIMILARITY (Z-SCORE) 2qihA 3ntnA 3ntnB 2qihA 9.3 1.3 1.9 3ntnA 1.5 30.1 28.4 3ntnB 0 28.4 30.8