Alignment of the silkworm OBP-like family members. The signal peptides are boxed. Conserved residues are shown with a green or light green background. Highly conserved cysteine residues are marked by dark arrowheads. The rectangles under the alignment represent α-helices identified in BmorPBP1. Vertical bars indicate that the intron occurs between codons. Backward slanted separators and forward slanted separators point out the splice sites within codons after the first base and the second base, respectively. Six conservative splice sites are marked by hollow arrowheads.