2.6.2: Signaling Molecules and Cellular Receptors
https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_2e_(OpenStax)/02%3A_Unit_II-_The_Cell/2.06%3A_Cell_Communication/2.6.02%3A_Signaling_Molecules_and_Cellular_Receptors
WebChemical signals are released by signaling cells in the form of small, usually volatile or soluble molecules called ligands. A ligand is a molecule that binds another specific molecule, in some cases, delivering a signal in the process. Ligands can thus be thought of as signaling molecules.
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