Bio-activity
Measured in a cell proliferation assay using enriched human B cells in the presence of IL-4. The ED50 for this effect is 0.2-1.2 ng/mL in the presence of 20 ng/mL of Recombinant Human IL-4 and a cross-linking antibody, Mouse Anti-Hemagglutinin/HA Peptide Monoclonal Antibody.
Storage
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
12 months from date of receipt, -20 to -70 centigrade as supplied.
1 month, 2 to 8 centigrade under sterile conditions after reconstitution.
3 months, -20 to -70 centigrade under sterile conditions after reconstitution.