Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1lfbA 2qkpA 2qkpB 1lfbA 100 0 0 2qkpA 0 100 99 2qkpB 0 99 100 FOLD SIMILARITY (Z-SCORE) 1lfbA 2qkpA 2qkpB 1lfbA 17.8 0 0 2qkpA 0 25.1 21.7 2qkpB 0 21.7 25