Vries, J.E. de

resection bowel animal ileum control intestine gastrin transection growth activity effect level jejunum bowel resection development ± sem length mucosa increase crypt adaptation sucrase experiment content dna content weight koldovsky gastroenterology percent figure result suckling serum transport mucosal group operation adult length growth change influence reference gastrin levels period formula suckling rats crypt depth breast milk johnson lactase chapter control animals sucrase activity antrectomy 1979. sunshine absorption villous height difference infant villu rna /dna ratio 1972. 60 percent kretchmer n birth hyperplasia depth macromolecules pentagastrin study section herbst breast ileal adult rats fundectomy colostrum specimen factor