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Signaling Begins Recognition Chemical Messenger Ligand Receptor Protein

Signaling starts with a receptor protein on a target cell detecting a specific ligand that fits its binding domain.

Signaling begins when a receptor protein on the target cell recognizes a specific ligand, which must match the receptor's binding domain.

Text Signaling begins with the recognition of a chemical messenger, a ligand, by a receptor protein in a target cell.  The ligand much match the receptor's ligand-binding domain.

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