Recombinant Protein;1MG;ActiveMax Human IL-4, Tag Free (IL4-H4218) is expressed from human 293 cells (HEK293). It contains AA His 25 - Ser 153 (Accession # P05112-1).;This protein carries no "tag". The protein has a calculated MW of 15.0 kDa. The protein migrates as 15 kDa and 19 kDa under reducing (R) condition (SDS-PAGE) due to glycosylation.;Immobilized ActiveMax Human IL-4, Tag Free (Cat. No. IL4-H4218) at 5 μg/mL (100 μL/well) can bind Biotinylated Human IL-4 R alpha, Avitag,His Tag (Cat. No. ILR-H82E9) with a linear range of 2-78 ng/mL (QC tested).;Immobilized ActiveMax Human IL-4, Tag Free (Cat. No. IL4-H4218) at 5 μg/mL (100 μL/well)can bind Human IL-4 R alpha, Fc Tag (Cat. No. ILR-H5253) with a linear range of 1-20 ng/mL (Routinely tested).;ActiveMax Human IL-4, Tag Free (Cat. No. IL4-H4218) stimulates the proliferation of TF-1 human erythroleukemic cells. The ED50 for this effect is 0.27-0.49 ng/mL (Routinely tested).