Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 5nbgA 5nbgB 5xjgA 5nbgA 100 99 5 5nbgB 99 100 5 5xjgA 5 5 100 FOLD SIMILARITY (Z-SCORE) 5nbgA 5nbgB 5xjgA 5nbgA 25.7 23.6 0 5nbgB 23.6 25.5 0 5xjgA 0 0 56.5