['Dietl et al. considered "intradecidual T cell tolerance towards fetal antigens" with their observation that intradecidual T cells lack immunohistochemically detectable amounts of T cell receptor (TCR) molecules while expressing normal amounts of CD3 molecules during early normal pregnancy (Am J Reprod Immunol. 1990; 24:33-36).', 'To reevaluate these findings we examined the TCR and CD3 expression on intradecidual T cells using flow cytometry.'] Are t-cell receptors expressed but down-regulated on intradecidual T lymphocytes?