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The leukocyte common antigen, T200, is expressed on all white blood cells but not on other differentiated cells. Within the hematopoietic lineage, specific cell types display characteristic structural forms of the molecule on their surface. We show that murine cytotoxic T lymphocyte clones and helper T cell clones contain different size mRNA for this molecule, and that the early precursors of T200 glycoprotein made in the helper and cytotoxic T cells differ in Mr. Thus, in addition to differences in posttranslational modifications, it is highly likely that a difference in protein structure contributes to the distinct forms of T200 glycoprotein found on these functional T cell subsets.

Different classes of T lymphocytes have different mRNAs for the leukocyte-common antigen, T200.