Fc5mu fragments were purified from a trypsin digest of native IgM by gel filtration and isoelectric focusing. Polyacrylamide gel electrophoresis of Fc5mu fragments in sodium dodecyl sulphate disclosed a major and a minor band with molecules of 320,000 and 285,000 daltons, respectively. The mu chain fragments showed a molecular weight of 34,500. After… (More)
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