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Multiple sequence alignment of BbZIP and AhZIP proteins. BbZIP protein from Bordetella bronchiseptica and 30 AhZIP proteins were aligned using ClustalW. The red bars indicate that amino acid residues possibly formed Zn2+ and Cd2+ binding sites in the BbZIP protein. The yellow highlighted motifs indicate histidine-rich domains (HRDs) in the long cytoplasmic loop between TM3 and TM4.
