Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 4athA 4athB 4ox0A 4ox0D 4athA 100 98 19 19 4athB 92 100 31 23 4ox0A 11 31 100 88 4ox0D 17 7 88 100 FOLD SIMILARITY (Z-SCORE) 4athA 4athB 4ox0A 4ox0D 4athA 10.6 8.7 4.3 4.5 4athB 8.5 10.9 4.3 4.4 4ox0A 3.9 4.3 10.3 8.3 4ox0D 3.9 3.4 8.3 10.2