Interferon type III
The recently classified type III interferon group consists of three IFN-λ (lambda) molecules called IFN-λ1, IFN-λ2 and IFN-λ3 (also called IL29, IL28A and IL28B respectively). These IFNs signal through a receptor complex consisting of IL10R2 (also called CRF2-4) and IFNLR1 (also called CRF2-12). 
Acceptance of this classification is less universal than that of type I and type II, and unlike the other two, it is not currently included in Medical Subject Headings.
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- Bartlett NW, Buttigieg K, Kotenko SV, Smith GL (June 2005). "Murine interferon lambdas (type III interferons) exhibit potent antiviral activity in vivo in a poxvirus infection model". J. Gen. Virol. 86 (Pt 6): 1589–96. doi:10.1099/vir.0.80904-0. PMID 15914836.