Which marker is used to identify monocytes?

Monocytes are a type of white blood cell essential for the immune response, and they express specific surface markers that help in their identification. CD13 is a well-known marker for monocytes. It is a part of the aminopeptidase family and is involved in various immune functions. The presence of CD13 on the surface of monocytes helps differentiate them from other cells in a hematological context, especially when analyzing blood samples using flow cytometry.

Other markers mentioned, such as CD25, CD20, and CD34, are associated with different cell types. CD25 is primarily expressed on activated T lymphocytes, CD20 is a marker found on B cells, and CD34 is generally associated with hematopoietic stem and progenitor cells. These markers define other cell populations, thus reinforcing the identification of CD13 specifically correlating with monocytes.