Microglobulin refers to a globulin of relatively small molecular weight. It can be contrasted to macroglobulin., Examples include: ...
<protein> Any small globular plasma protein ... (18 Nov 1997) ... 
(mi″kro-glob´u-lin) any globulin, or any fragment of a globulin, of low molecular weight.
Any small globular plasma protein. See beta-2-microglobulin.
Type: Term Pronunciation: mī′krō-glob′yū-lin Definitions: 1. Any serum or urinary globulin with a molecular mass less than about 40 kDa, including especially Bence Jones proteins, under protein. 2. On occasion, a term used to refer to 7S immunoglobins (IgG).