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Schematic representation of the proposed positions of free Cys residues and disulfide bonds in glutelins A and B and glycinin A1aB1b. White and hatched areas are the acidic and the basic polypeptides, respectively. N and C represent the NH2 and COOH termini, respectively. The Cys residues are numbered by Roman numerals from the NH2 terminus. Disulfide bonds are represented by lines connecting two Cys residues.
