An object or substance by which something is mediated, such as

1. (Science: anatomy) A structure of the nervous system that transmits impulses eliciting a specific response.

2. (Science: chemistry) A chemical substance (transmitter substance) that induces activity in an excitable tissue, such as nerve or muscle, or

3. (Science: cell biology) A substance released from cells as the result of the interaction of antigen with antibody or by the action of antigen with a sensitised lymphocyte.

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