CD13 is expressed on cells of the myelomonocyte lineage including myeolomonocyte precursors, monocytes, basophiles, eosinophils, neutrophils and myeloid leukemia's. The antigen is also present on small intestine and renal proximal tubule epithelial cells, synaptic membranes of the central nervous system, fibroblasts and osteoclasts. The main cellular activity of this antibody is monocytes and granulocytes. Other reactive cells in flow cytometry incl. myeloid leukemia's and myeloid cell lines. Other reactive cells in immunohistology incl. histiocytes, high endothelial venules and kidney tubules.Synonyms: ANPEP, APN, Alanyl aminopeptidase, Aminopeptidase M, Aminopeptidase N, Microsomal aminopeptidase, Myeloid plasma membrane glycoprotein CD13, PEPN, gp150