- BP000147-CYT-033: Recombinant Rat IL-21 
 
 Source: E. coli-derived.
 The biological activity is measured by its ability to proliferate activated B cells.
 Purity: > 95.0% as determined by RP-HPLC and SDS-PAGE.
- BP000147-CYT-408: Recombinant Human IL-21 
 
 Source: E. coli-derived.
 The ED50=1-10 ug/ml corresponding to a Specific Activity of 0.1-1 MIU/mg , determined by the dose-dependant proliferation of human peripheral blood mononuclear cells.
 Purity > 95%, by SDS-PAGE and RP-HPLC.
- BP000147-CYT-684: Recombinant Mouse IL-21 
 
 Source: E. coli-derived.
 The ED50=10-50 ug/ml, determined by the cell proliferation assay of modified Ba/F3 cells.
 Purity > 95%, by SDS-PAGE and RP-HPLC.