Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2irpA 3fpwA 3u97A 2irpA 100 52 21 3fpwA 52 100 0 3u97A 18 26 100 FOLD SIMILARITY (Z-SCORE) 2irpA 3fpwA 3u97A 2irpA 41.4 0.7 0 3fpwA 0.7 30.8 0 3u97A 0 0 19