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LN-5 monoclonal antibody against human macrophages was found to selectively stain human sebaceous glands in formalin-fixed, paraffin-embedded skin samples. Undifferentiated sebocyte progenitors were negative, and only sebocytes from the onset of their differentiation revealed positive cytoplasmic immunofluorescence. Since there are very few selective and easy-to-use markers of sebaceous glands, LN-5 antibody can offer a simple and relatively specific way to detect human sebocytes from the onset of their differentiation in routinely processed material, both freshly prepared and archival.