Selenium

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 Selenium is the 34th element in the periodic table, with atomic mass of 78.96.[1] It is the key element in selenocysteine (a cysteine amino acid where the sulphur atom is replaced by a selenium atom), an amino acid that occurs infrequently in proteins in both eukaryotes and prokaryotes


References

  1. Royal Society of Chemistry (2011), Selenium. http://www.rsc.org/periodic-table/element/34/selenium Last accessed 27/11/2014