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Sequence alignment of BBP-A and AVD. Identical residues are shown in gray shading. The signal peptides are omitted from the alignment. Secondary structure elements are indicated according to the BBP-A – BSO structure (chain A). The amino acids within 4 Å of BSO in the BBP-A – BSO structure (and the equivalent residues in AVD) are boxed. The residues mutated in this study are indicated by an asterisk. The glycosylation site of BBP-A is indicated by an arrow.
