epitheliolysin

ep·i·the·li·ol·y·sin (ep″ĭ-the″le-olґə-sin) a cytolysin formed in the serum of an animal when epithelial cells from an animal of a different species are injected. The epitheliolysin has the power of destroying epithelial cells of an animal of the same species as that from which the epithelial cells were originally taken.