Totoxicity fraction from Euphorbia pekinensis and composition change after vinegar processing Effect of Glycyrrhizae Radix et Rhizoma combined with Atractylodis Macrocephalae Rhizoma on p53 and p21 gene expression of IEC-6 cells Study on detoxication of Euphorbia Pekinensis Radix processed with vinegar on rat small intestinal crypt epithelial cells IEC-6 Effect of flavonoid from Glycyrrhizae Radix on small intestine epithelium IEC-6 cell migration and intracellular polyamine content Effects of Astragali Injection and extracts from Atractylodes macrocephala on IEC-6 cell migration