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It is surprising, yet interesting to note that cells communicate with one another in a process known as cell signalling. Just as humans communicate by speaking, fowls by cocking, cats by mewing and dogs by barking. In cell signalling, a cell produces ligands (complex molecules of atoms) that binds specifically to the receptor on the recipient cell. The binding of the ligands released by one cell to the receptor site on the surface of the recipient cell elicits a reaction within the later. For communication (Signaling) to occur in living cells, there must be ligand-receptor compatibility. Ligand- receptors in cells exist in a lock and key model. (more…)