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

1. <anatomy> A structure of the nervous system that transmits impulses eliciting a specific response.

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

3. <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.

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)

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