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Secondary structural model of retinochrome showing the location of Glu and Asp residues (white letters). For affinity purification with an anti-rhodopsin antibody, the amino acid sequence of monoclonal antibody Rho1D4 epitope (ETSQVAPA) is introduced to the C terminus of retinochrome. On the basis of sequence alignment, the bovine rhodopsin amino acid residue numbering system is used. The retinochrome numbering system is shown in parentheses.
