Monoclonal antibodies specific for murine IgM I. Characterization of antigenic determinants on the four constant domains of the μ heavy chain

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Abstract
Seventeen monoclonal rat antibodies with specificities for mouse μ heavy chain recognize seven distinguishable determinants that are located on the four constant region domains. All determinants are present on secreted, intracellular and membrane bound IgM, and all but two are expressed on isolated μ heavy chain. One antibody, specific for a site in the first constant region domain, recognizes a determinant that is present on IgM of AKR, C3H/HeJ, C57BL/6J, SJL, DBA/2, BALB/c, NZB and CBA/J mouse strains, but not on IgM of A.TH, A/J and A.CA strains of mice.