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ATPase activity in the presence of Triton X-100. (A) ATPase activity of full length, membrane-bound CD39 was measured in the presence of the indicated nonsolubilizing concentrations of Triton X-100. (B) ATPase activity in the presence of 0.005% Triton X-100 was measured for full length CD39, NT, CT, and soluble CD39 and expressed as a fraction of native full length CD39 activity.
