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One of the IgM preparations was without J chain, while the two others contained J chain. The experiments revealed that IgM with J chain consisted of pentameric molecules: whereas in IgM preparations without J chain the dominating molecules were hexamers, but also pentamers, tetramers, and even smaller molecules were found. In both types of IgM the molecules formed a wide range of aggregates, which were usually more abundant in the purified IgM than in serum. Some of the aggregates were kept together by noncovalent forces only.<\/jats:p>","DOI":"10.1111\/j.1365-3083.1975.tb02620.x","type":"journal-article","created":{"date-parts":[[2006,6,30]],"date-time":"2006-06-30T11:38:47Z","timestamp":1151667527000},"page":"217-228","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["IgM Molecules with and without J Chain in Serum and after Purification, Studied by Ultra\u2010centrifugation, Electrophoresis, and Electron Microscopy"],"prefix":"10.1111","volume":"4","author":[{"given":"T.","family":"ESKELAND","sequence":"first","affiliation":[]},{"given":"T. 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