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[Protein assimilation and acid proteinases in the postnatal gastrointestinal tract in experimental studies].

Proximal-distant gradient of the lysosomal proteinase activity distribution is observed in the mammals at the postnatal period of development. In various species of mammals the proximal-distal gradient of the lysosomal proteinase distribution is attended by the shift of the final stages of the intestinal digestion to the distal part of the small intestine. These features are typical of the protein digestion in the mammals at the postnatal period of development. The protein digestion in adult mammals is characterized by a uniform distribution of lysosomal proteinases between the small intestine parts and by the completion of the protein intestinal digestion in the proximal part of the small intestine.