Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2zzdE 2zzdF 3szgA 2zzdE 100 5 100 2zzdF 5 100 24 3szgA 76 37 100 FOLD SIMILARITY (Z-SCORE) 2zzdE 2zzdF 3szgA 2zzdE 20.2 3.5 0.6 2zzdF 3.5 37.4 0 3szgA 0.9 0 63.5