SLK (STE20-like kinase) is a serine/threonine kinase that regulates key cellular processes such as proliferation, migration, survival, and cytoskeletal organization. Primarily located in the cytoplasm, SLK affects cell shape and movement by phosphorylating proteins associated with cytoskeletal dynamics, including FAK, paxillin, and cortactin. It plays a central role in signaling pathways that govern cell morphology and motility.