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Wiktionary
microglobulin

n. 1 A low molecular-weight globulin. 2 A peptide fragment of a globulin.

Wikipedia
Microglobulin

Microglobulin is a globulin of relatively small molecular weight. It can be contrasted to macroglobulin.,

Examples include:

  • Beta-2 microglobulin
  • Alpha-1-microglobulin