Abstract
Sialic acid has been shown to be part of the antigenic determinant of the Thy-1.2 alloantigen as expressed by the murine cell line S-49.1 TB-2-3 (S-49). This conclusion is based on the loss of cytotoxic inhibitory activity by the action of neuraminidase on the Thy-1.2 alloantigen. Also, sialic acid has the ability to inhibit the cytotoxic assay of AKR anti-C3H Thy-1.2 serum for S-49 cells. Further evidence for the protein nature of the Thy-1.2 alloantigen is apparent by trypsin digestion. Possibly the Thy-1.2 alloantigen as expressed on S-49 cells is a glycoprotein.
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