Synthetic peptide from the intracellular part of the e
-chain of human CD3 was coupled to bovine thyroglobulin and used for immunization. The antibody is a pan-T cell marker for identification of T cells. It is well-suited for labeling reactive T cells in tissue with lymphoid infiltrates, and for classification of T-cell neoplasms. The antibody shows a stronger labeling intensity than corresponding monoclonal antibodies to CD3, and should, generally, be preferred on formalin-fixed, paraffin-embedded tissue sections.