IFN-λ-1,-2, and -3 (also known as IL-29, IL-28A and IL-28B respectively) are distantly related to the IL-10 family and Interferons. All three IFN-lambdas uses a distinct receptor system composed of an IFN-λR1 subunit (also called CRF2-12) and IL-10R2 subunit (also called CRF2-14). Signaling through this receptor system induces anti-viral defense similar but distinct than the type I Interferons.(Kotenko, SV. et al. Nat Immunology 2003  p. 69-77). Recombinant human IFN-λ 2 is a 19.6 kDa protein containing 174 amino acid residues.
- Store in working aliquots at -20°C. Avoid freeze/thaw cycles.