develops_from develops from develops from capable of capable_of capable of fibroblast fibrocyte Cultured human fibrocytes are MHCI-positive, MHCII-positive, CD1a-negative, CD3-negative, CD4-negative, CD8-negative, CD10-negative, CD11b-positive, CD13-positive, CD14-negative, CD16-negative, CD18-positive, CD19-negative, CD25-negative, CD29-positive, CD32-positive, CD33-negative, CD34-positive, CD38-negative, CD40-positive, CD44-negative, CD45RO-positive, CD49a-positive, CD49b-positive, CD49c-negative, CD49d-negative, CD49e-positive, CD49f-negative, CD56-negative, CD58-positive, CD61-positive, CD64-positive, CD70-negative, CD71-positive, CD80-positive, CD83-negative, CD86-positive, CD103-negative, CD105-positive, CD181-positive, CD182-negative, CD183-positive, CD184-positive, CD185-negative, CD186-negative, CD191-positive, CD192-negative, CD193-positive, CD194-positive, CD195-positive, CD196-negative, CD197-positive, CD199-positive, desmin-negative, F4/80-positive, Gr1-positive, LSP-1-positive, MHCI-positive, MHCII-positive, alpha-SMA-negative, TCRab-negative, TCRgd-negative, and vimentin-positive. Fibrocytes are also capable of secreting angiogenin, bFGF, CCL2, CCL3, CCL4, CCL8, CXCL1, type I collagen, type III collagen, CTGF, fibronectin, GM-CSF, IL-1a, IL-6, IL-8, IL-10, M-CSF, MMP-9, PDGF-A, TGF-alpha, TGF-beta1, TNF-alpha, and VEGF-A. An inactive fibroblast; cytoplasm is sparse, endoplasmic reticulum is scanty with flattened nucleus. Term used by some histologists; when fibroblasts become relatively inactive in fiber formation. However, this cell has the potential for fibrogenesis in quiescent connective tissue of the adult, as well as during development, other histologists prefer to use the term fibroblast in all circumstances. These cells represent ~0.5% of peripheral blood leukocytes. FMA:63879 stromal cell antigen processing and presentation of peptide antigen via MHC class II positive regulation of angiogenesis