Biological Activity：Fully biologically active when compared to standard. The ED50 as determined by a cell proliferation assay using human TF-1 cells is less than 0.2 ng/ml, corresponding to a specific activity of > 5.0 × 106 IU/mg.
Purity：> 98 % by SDS-PAGE and HPLC analyses.
Formulation：Lyophilized from a 0.2 µm filtered concentrated solution in PBS, pH 7.4.
