SLK (STE20-like kinase) is a serine/threonine kinase involved in regulating key cellular processes such as proliferation, migration, survival, and cytoskeletal organisation. Located mainly in the cytoplasm, SLK influences cell shape and movement by phosphorylating proteins linked to cytoskeletal dynamics, including FAK, paxillin, and cortactin. It plays a central role in signalling pathways that control cell morphology and motility.