Clone 19-OLE is a mouse monoclonal antibody specific to the human gene, ABO, or ABO, alpha 1-3-N-acetylgalactosaminyltransferase and alpha 1-3-galactosyltransferase. Indicated applications for antibody clone 19-OLE include immunohistochemistry, immunofluorescence, ELISA, and immunocytochemistry.