Polysaccharides, proteins, nucleic acids, enzymes and sulfate uptake of the gastric epithelial cells of Xenodon merremii Wagler, 1824 (Ophidia): an histochemical and autoradiographic study - Ferri, Sylvio; Sottovia Filho, Dagoberto; Medeiros, Luiz Octávio (Acta histochemica, 1975)