Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1nbaC 1zs4A 3vuqA 1nbaC 100 0 0 1zs4A 0 100 31 3vuqA 6 31 100 FOLD SIMILARITY (Z-SCORE) 1nbaC 1zs4A 3vuqA 1nbaC 43.7 0 0 1zs4A 0 13.4 0.7 3vuqA 0 0.7 29.6