The γ-globulins of low molecular weight in human urine have been partially fractionated and characterized. The two principal components are made up of "light" polypeptide chains of 7 S γ-globulin. One of these components, the "monomer", has a molecular weight in dissociating solvents of approximately 20,000 and probably consists of single light chains. The other component, the "dimer", has a molecular weight of approximately 40,000 and probably consists of pairs of light chains joined by intermolecular disulfide bonds.
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Freedman et al. (1964) studied this question.
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