passages.id: split_4_test_368_passage
passages.type: progene_text
passages.text: Enforced expression of Id3 , which has the capacity to inhibit many basic helix - loop - helix ( bHLH ) transcription factors , in human CD34 ( + ) hematopoietic progenitor cells that have not undergone T cell receptor ( TCR ) gene rearrangements inhibits development of the transduced cells into TCRalpha beta and gamma delta cells in a fetal thymic organ culture ( FTOC ) .