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