Biological Activity：Fully biologically active when compared to standard. The ED50 as determined by a cytotoxicity assay using murine L929 cells is less than 0.05 ng/ml, corresponding to a specific activity of > 2.0 × 107 IU/mg in the presence of actinomycin D.
Purity：> 98 % by SDS-PAGE and HPLC analyses.
Formulation：Lyophilized from a 0.2 μm filtered concentrated solution in 20 mM PB, 10 mM Nacl, pH 7.0.
