Abstract
An immunochemical study has been made of chromatophores of Rhodospirillum rubrum and of fragments obtained from these cell particles by sonic irradiation and chemical treatment. Serologically univalent material is released from chromatophores by chemical scission of disulfide bonds. The data indicate that chromatophore antigens are inserted into the structure as a repeating matrix of antigenic sites spaced with the determinant groups placed between each pair of disulfides. Evidence for the reversibility of antigen scission and information about the nature of the chromatophore subunits are presented.
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