Fig. 4From: Inhibition of ecto-ATPase activity by curcumin in hepatocellular carcinoma HepG2 cellsRelationship between ATP concentration and the curcumin-sensitive ecto-ATPase activity. a Ecto-nucleotidase activities were measured in the presence and absence of 30 μM curcumin, and the curcumin-sensitive ecto-ATPase activity was estimated. n = 4. b Lineweaver-Burk plots of the curcumin-sensitive ecto-ATPase activity versus ATP concentration from 30 μM to 3 mMBack to article page