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Erowid References Database

Welsh JH. 
“Marine invertebrate preparations useful in the bioassay of acetylcholine and 5-hydroxytryptamine”. 
Nature. 1954;173:955.
Abstract
LSD was found to be a highly effective antagonist of 5-hydroxytryptamine (serotonin) on the heart of Venus mercenaria, Cyprina islandica and Buccinum undatum.
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