====== Cell signalling ====== Cell [[signalling]], also known as [[cellular signaling]] or [[signal transduction]], refers to the process by which [[cell]]s communicate and coordinate their activities in response to internal or external cues. It involves the [[transmission]] of [[signal]]s from the [[cell surface]] or the extracellular [[environment]] to the interior of the [[cell]], leading to specific cellular [[response]]s. [[Cell signaling]] is crucial for the [[regulation]] of various cellular processes, including [[growth]], [[development]], [[metabolism]], [[differentiation]], and [[immune response]]s. It ensures that cells can respond appropriately to changes in their [[environment]] and maintain [[homeostasis]]. see [[Signaling pathway]].