Abstract
To the Editor: Beta2-microglobulin forms the light chain of the HLA antigen on the surface of nucleated cells.1 The turnover of the cell membrane is the main source of the serum beta2-microglobulin, which is then excreted by the kidneys. The serum concentration increases when the glomerular filtration decreases or when the production of beta2-microglobulin increases, as in lymphoproliferative disorders.1 We recently observed a case of immunodeficiency in a homosexual man who had the highest serum level of beta2-microglobulin recorded in our laboratory. The patient was a Swiss citizen residing in New . . .

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