- Epithelial glycoprotein is a member of a family of epithelial cell surface antigens homologous to nidogen, a matrix adhesion protein. Simon, B., Podolsky, D.K., Moldenhauer, G., Isselbacher, K.J., Gattoni-Celli, S., Brand, S.J. Proc. Natl. Acad. Sci. U.S.A. (1990)