Interleukin-30 is a protein with a molecular weight of 28 kilodaltons, which forms one chain of the heterodimeric cytokine

Cytokine

Cytokines are small cell-signaling protein molecules that are secreted by the glial cells of the nervous system and by numerous cells of the immune system and are a category of signaling molecules used extensively in intercellular communication...

 called interleukin 27

Interleukin 27

Interleukin-27 is a heterodimeric cytokine belonging to the IL-12 family that is composed of two subunits, Epstein-Barr virus -induced gene 3 and IL27-p28 ....

 (IL-27), thus is sometimes called IL27-p28. The other chain of IL-27 is a molecule called Epstein-Barr induced gene-3 (EBI3). IL-30 is a member of the long-chain, 4-helix bundle family of cytokines, making it structurally similar to IL-6

Interleukin 6

Interleukin-6 is a protein that in humans is encoded by the IL6 gene.IL-6 is an interleukin that acts as both a pro-inflammatory and anti-inflammatory cytokine. It is secreted by T cells and macrophages to stimulate immune response, e.g. during infection and after trauma, especially burns or other...

. This gene for this molecule is now officially called IL-27 under HGNC guidelines.