Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 1envA 3vu5A 5h0nA 1envA 100 5 5 3vu5A 3 100 21 5h0nA 3 21 100 FOLD SIMILARITY (Z-SCORE) 1envA 3vu5A 5h0nA 1envA 13.5 4.6 4.8 3vu5A 4.6 5.9 5 5h0nA 4.8 5 6.1