Ergothioneine is a naturally occurring amino acid and is a thiourea derivative of histidine, containing a sulfur atom in the imidazole ring. This compound is made in rather few organisms, notably Actinobacteria, Cyanobacteria, and certain fungi. Ergothioneine was discovered in 1909 and named after the ergot fungus from which it was first purified,...
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http://en.wikipedia.org/wiki/Ergothioneine
(from the article `semen`) ...the sperm cells. Sperm mature in the epididymis; they then pass through a long tube called the ductus, or vas, deferens to another storage area, ...
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http://www.britannica.com/eb/a-z/e/40
<chemical> Chemical name: 1H-Imidazole-4-ethanaminium, alpha-carboxy-2,3-dihydro-N,N,N-trimethyl-2-thioxo-, inner salt, (S)- ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: er′gō-thī′ō-nē′in Definitions: 1. The betaine of a sulfur-containing derivative of histidine, present in blood and other mammalian tissue and in ergot. Synonyms: thiolhistidylbetaine, thioneine
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http://www.medilexicon.com/medicaldictionary.php?t=30163
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