Influence of DAPT treatment on differentiation of human CD34⁺CD1^- thymic progenitor cells in human-mouse hybrid FTOC. Murine fetal thymic lobes were seeded with human CD34⁺CD1^- thymic progenitor cells and cultured for 13 (A) or 19 (B) days in the absence or presence of 10 μM DAPT. Representative dot plots of 4 independent experiments are shown.