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HLA class II expression in Graves' disease

HLA class II expression in Graves' disease
Thyroid tissue from a patient with Graves' hyperthyroidism. The brown staining indicates the presence of HLA class II (DR) molecules which are not expressed in normal thyroid tissue.
HLA: human leukocyte antigen.
Courtesy of Terry F Davies, MD, FRCP.
Graphic 59711 Version 2.0