Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1izcA 2z7bA 6cdbA 1izcA 100 56 21 2z7bA 52 100 15 6cdbA 15 14 100 FOLD SIMILARITY (Z-SCORE) 1izcA 2z7bA 6cdbA 1izcA 50.8 0 0 2z7bA 0 45.1 0 6cdbA 0 0 21.1