
In pharmacology, partial agonists are drugs that bind to and activate a given receptor, but have only partial efficacy at the receptor relative to a full agonist. They may also be considered ligands which display both agonistic and antagonistic effects - when both a full agonist and partial agonist are present, the partial agonist actually acts as...
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http://en.wikipedia.org/wiki/Partial_agonist

A partial agonist is an agonist which is unable to induce maximal activation of a receptor population, regardless of the amount of drug applied (See also Intrinsic activity).
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http://www.chem.qmul.ac.uk/iupac/medchem/ix.html

Agonist for a receptor population that is unable to produce a maximal response even if all the receptors are occupied.
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http://www.encyclo.co.uk/visitor-contributions.php
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