we conclude : ( 1 ) that production of a large panel of monoclonal antibodies to respiratory tract mucins from primates is feasible , ( 2 ) that the monoclonal antibodies will recognize epitopes on biochemically identifiable glycoproteins , and ( 3 ) that the intracellular mucous products of tracheal secretory cells exhibit greater heterogeneity than is detectable by conventional histochemistry .
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the
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secretory