'''Interleukins''' (IL) adalah sekelompok [[sitokin]] ([[Protein|protein yang]] disekresikan dan [[Pensinyalan sel|molekul sinyal]]) yang pertama kali diekspresikan oleh [[sel darah putih]] ([[Sel darah putih|leukosit]]). IL dapat dibagi menjadi empat kelompok besar berdasarkan fitur struktural yang membedakan. Namun, kesamaan urutan asam amino mereka agak lemah (biasanya 15-25% identitas). [[Genom manusia]] menyandi lebih dari 50 interleukin dan protein terkait. <ref>{{Cite journal|date=Oct 2010|title=Evolutionary divergence and functions of the human interleukin (IL) gene family|url=http://www.humgenomics.com/content/5/1/30|journal=Human Genomics|volume=5|issue=1|pages=30–55|doi=10.1186/1479-7364-5-1-30|pmc=3390169|pmid=21106488}}</ref> {{Infobox protein family|Symbol=IL1|Name=Interleukin 1 / 18|image=3LTQ.pdb.png|width=|caption=Struktur kristal interleukin 1B manusia.<ref name="pmid21182275">{{PDB|3LTQ}}; {{cite journal | vauthors = Barthelmes K, Reynolds AM, Peisach E, Jonker HR, DeNunzio NJ, Allen KN, Imperiali B, Schwalbe H | title = Engineering encodable lanthanide-binding tags into loop regions of proteins | journal = Journal of the American Chemical Society | volume = 133 | issue = 4 | pages = 808–19 | date = Feb 2011 | pmid = 21182275 | pmc = 3043167 | doi = 10.1021/ja104983t }}</ref>|Pfam=PF00340|InterPro=IPR000975|SMART=SM00125|PROSITE=PDOC00226|SCOP=1i1b|TCDB=|OPM family=|OPM protein=}}
