Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1zlaE 1zlaF 3w99A 3w99B 1zlaE 100 21 98 13 1zlaF 29 100 29 92 3w99A 98 21 100 11 3w99B 13 92 13 100 FOLD SIMILARITY (Z-SCORE) 1zlaE 1zlaF 3w99A 3w99B 1zlaE 14.2 8 14.6 8 1zlaF 4.2 15.5 4.1 12.6 3w99A 14.6 8 16.2 7.5 3w99B 8 12.6 8 14.9