title: Low molecular weight IgM as a pitfall in immunoglobulin quantitation by radial diffusion.
mesh_terms: D000328:Adult; D001172:Arthritis, Rheumatoid / Q000097:blood; D002850:Chromatography, Gel; D005260:Female; D006801:Humans; D005779:Immunodiffusion; D007122:Immunoelectrophoresis; D007075:Immunoglobulin M / Q000032:analysis*; D007136:Immunoglobulins / Q000032:analysis; D008722:Methods; D008970:Molecular Weight; D014461:Ultracentrifugation; D005719:gamma-Globulins / Q000032:analysis*
chemical_list: D007075:Immunoglobulin M; D007136:Immunoglobulins; D005719:gamma-Globulins