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Sequence alignment of the N-terminal domains of the β2 and β3 subunits. Amino acids that differ between the β2 and β3 subunits are indicated (*). The joins between the two subunits in the β2β3 chimeras are shown by arrows. The four residues that affect cell surface expression are inbold. The presumed Cys–Cys loop is indicated. Theboxed region indicates the first presumed transmembrane domain.
