passages.id: split_5_test_1714_passage
passages.type: progene_text
passages.text: Fibrocytes are a distinct population of blood - borne cells that display a unique cell surface phenotype ( collagen I + / CD11b + / CD13 + / CD34 + / CD45RO + / MHC class II + / CD86 + ) and exhibit potent immunostimulatory activities .