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Cellular signalling
Cellular signalling is the communication system used by cells in multicellular organisms to regulate their metabolic processes, development, organisation and activity. The molecules involved in these exchanges (“ligands” can be hormones, neurotransmitters, growth factors, etc.) carry out intercellular signalling, i.e. transmit information via chemical signals that are decoded by cell receptors, and intracellular communication, or in other words the transfer of these messages within cells. For example, they can send messages of differentiation, quiescence (interruption of division), proliferation and death (apoptosis) to the cell.