passages.id: split_4_test_1261_passage
passages.type: progene_text
passages.text: Monocytic DC precursors from peripheral blood mononuclear cells ( PBMC ) were enriched either by adhesion to a plastic surface or CD14 - positive selection and cultured for 7 days in serum - free medium containing GM-CSF , interleukin ( IL ) - 4 and PRL , alone or in combination .