passages.id: split_4_test_408_passage
passages.type: progene_text
passages.text: Here we show that FKHR , a human homologue of the DAF16 transcription factor in Caenorhabditis elegans , is rapidly phosphorylated by human protein kinase Balpha ( PKBalpha ) at Thr-24 , Ser-256 , and Ser - 319 in vitro and at a much faster rate than BAD , which is thought to be a physiological substrate for PKB .