Word Count : 196

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In the context of cell-to-cell signalling, a ligand can be defined as a molecule that serves as a chemical messenger, capable of binding specifically to a receptor on the surface or inside a target cell, thereby initiating a biological response. Ligands can be proteins, peptides, lipids, or small molecules, __________ ______ ____ ______ __________ _____ ____ _________.
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