passages.id: split_4_test_2671_passage
passages.type: progene_text
passages.text: In addition , two sFv clones ( 3R6 - 1 and 2R6 - 21 ) that mapped to the cyclin box domains markedly inhibited Tat - mediated transactivation in several transiently transfected cell lines without inhibiting basal transcription or inducing apoptosis .