Abstract
Summary A tissue antigen reactive with sera from SLE patients has been partially characterized. The antigen is a soluble cytoplasmic component which is present in a variety of human tissues and is distinct from known nuclear antigens. It is an acidic macromolecule which has the electrophoretic mobility of an α1 globulin and is resistant to most proteolytic enzymes including trypsin, pepsin and chymotrypsin. Antigenicity is destroyed by 0.02 M periodate and by 0.001 M parahydroxy mercuribenzoate. Antibodies to this antigen have been found in 40% of unselected LE sera and were absent from a large number of sera from normal persons and from the sera of patients with other connective tissue disorders.
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