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In biochemistry, an ultratrace element is a chemical element that normally comprises less than one microgram per gram of a given organism (i.e. less than 0.0001% by weight), but which plays a significant role in its metabolism.
- J. Mann & A. S. Truswell (editors). Essentials of Human Nutrition (3rd edition, 2007). Oxford: Oxford University Press
- Nielsen, Forrest H., Ultratrace Elements in Nutrition, Annual Review of Nutrition Vol. 4: 21-41 (Volume publication date July 1984)
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