Figure 2.

Major landmarks in eutherian connexin protein sequence alignments. The black squares labelled common cysteine amino acid residues and white squares labelled common N-glycosylation sites. The connexin amino acid signature common cysteine amino acid residues that were implicated in disulfide bonding were labelled by stars. The numbers indicated numbers of amino acid residues. The human substitutions of common cysteine amino acid residues were also indicated.