酵素活性:Fully biologically active when compared to standard. The ED50 as determined by inhibiting TWEAK- dependent proliferation of human umbilical vein endothelial cells (HUVEC) is less than 30 ng/ml, corresponding to a specific activity of > 3.3 × 104 IU/mg, in the presence of 15 ng/ml of rHuTWEAK.