Some histochemical aspects of keratinization of oral, esophageal and gastric membrane of the albino rat.

Using histochemical methods a comparative study was carried out, to identify important substances at the keratinization metabolism. With the results obtained, we may conclude that: a) in the four layers of all regions studied, it was possible to detect the presence of the characteristic active radicals of the amino acids cysteine, cystine and arginine, mainly in the corneus layer; b) the presence of -SH radicals of cysteine in the keratohyalin granules was evident in all regions studied.