FIG. 1.
Amino acid deletions in the pre-S2 region of the S gene. Deletions (shown in the form Δx/y, where x is the position of the first deleted amino acid and y is the position of the last deleted amino acid) are indicated as thin lines. Positions are given relative to the first N-terminal amino acid of the L protein (subtype ayw, EMBL accession no. X02496).