at 96 hours , when mtx was no longer detectable in serum , the intestine had entered a proliferative phase characterised by increased crypt mitoses , accelerated migration of enterocytes along villi , and the presence on villi of epithelial cells with the enzyme profile of crypt cells , decreased disaccharidase , alkaline phosphatase , and na+-k+atpase activities and increased thymidine kinase activity .
C0021853
intestine
C0682610
enterocytes