To test this hypothesis, we checked the expression of S1P receptors (S1P1–5), which regulate the egress of T cells from the thymus10. Although eexgrpersesssfiroonmotfheS1thPy1m, wush1i0c,hshisowcreidticaatlrefonrd CD4 SP thymocytes to of reduction in Brd1D/D 4 NATURE COMMUNICATIONS ...