however , some epithelial structures express abh antigens in nonsecretor baboons ( e.g. , striated ducts ) , some cells express only h without a or b ( e.g . biliary ducts and acinar cells of salivary glands ) , and some cells express only the h antigen at early stages of differentiation and the a or b antigens at later stages of differentiation ( e.g . epidermis ) .
C0007634
cells
C0007589
differentiation