
Muscarine, L-(+)-muscarine, or muscarin is a natural product found in certain mushrooms, particularly in Inocybe and Clitocybe species, such as the deadly C. dealbata. Mushrooms in the genera Entoloma and Mycena have also been found to contain levels of muscarine which can be dangerous if ingested. Muscarine has been found in harmless trace amount...
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http://en.wikipedia.org/wiki/Muscarine

(from the article `drug`) Both acetylcholine and norepinephrine act on more than one type of receptor. Dale found that two foreign substances, nicotine and muscarine, could ...
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http://www.britannica.com/eb/a-z/m/142

Toxin (alkaloid) from the mushroom Amanita muscaria (Fly Agaric) that binds to (muscarinic) acetylcholine receptors. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973

(mus´kә-rēn) a deadly alkaloid from various mushrooms, such as Amanita muscaria (the fly agaric), and also from rotten fish. See also muscarinic receptors.
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http://www.encyclo.co.uk/local/21001

Toxin (alkaloid) from the mushroom Amanita muscaria (Fly Agaric) that binds to (muscarinic) acetylcholine receptors.
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Type: Term Pronunciation: mŭs′kă-rēn, -rin Definitions: 1. A toxin with neurologic effects, first isolated from Amanita muscaria (fly agaric) and also present in some species of Hebeloma and Inocybe. The quaternary trimethylammonium salt of 2-methyl-3-hydroxy-5-(aminomethyl)tetrahydrofuran, it is a cholinergic substance whose p...
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http://www.medilexicon.com/medicaldictionary.php?t=56566

a poisonous compound, CHNO, found in certain mushrooms, esp. fly agaric, and in decaying fish.
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https://www.infoplease.com/dictionary/muscarine
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