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Four new members expand the IL-1 superfamily.

Smith D.E., Renshaw B.R., Ketchem R.R., Kubin M., Garka K.E., Sims J.E.

We report here the cloning and characterization of four new members of the interleukin-1 (IL-1) family (FIL1delta, FIL1epsilon, FIL1zeta, and FIL1eta, with FIL1 standing for "Family of IL-1"). The novel genes demonstrate significant sequence similarity to IL-1alpha, IL-1beta, IL-1ra, and IL-18, and in addition maintain a conserved exon-intron arrangement that is shared with the previously known members of the family. Protein structure modeling also suggests that the FIL1 genes are related to IL-1beta and IL-1ra. The novel genes form a cluster with the IL-1s on the long arm of human chromosome 2.

J. Biol. Chem. 275:1169-1175(2000) [PubMed] [Europe PMC]

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