The protein family, Interleukin-28A, plays an important role in modulating the immune system. This protein family is induced by viral infection and interacts with a class II receptor [1]. This family of proteins is found in eukaryotes. Proteins in this family are typically between 145 and 195 amino acids in length.

1: IL-28, IL-29 and their class II cytokine receptor IL-28R. Sheppard P, Kindsvogel W, Xu W, Henderson K, Schlutsmeyer S, Whitmore TE, Kuestner R, Garrigues U, Birks C, Roraback J, Ostrander C, Dong D, Shin J, Presnell S, Fox B, Haldeman B, Cooper E, Taft D, Gilbert T, Grant FJ, Tackett M, Krivan W, McKnight G, Clegg C, Foster D, Klucher KM; Nat Immunol. 2003;4:63-68. PMID:12469119