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An amino acid which is a constituent of most proteins. It is an essential nutrient in the diet of vertebrates.
- ‘For example, eggs are high in alanine and methionine; whey protein is high in tryptophan and threonine.’
- ‘Peptides are named by the position of tryptophan in the amino acid sequence.’
- ‘Key essential amino acids are valine, leucine, isoleucine, tryptophan and methionine.’
- ‘Two known enzymes catabolize the essential amino acid tryptophan in mammals.’
- ‘Negative dietary changes are related to the deficiency of maize in the amino acids tryptophan and lysine.’
Late 19th century: from tryptic ‘relating to trypsin’ + Greek phainein ‘appear’.
We take a look at several popular, though confusing, punctuation marks.
From Afghanistan to Zimbabwe, discover surprising and intriguing language facts from around the globe.
The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.