Assertion: polypeptide's amino acid | /r/HasProperty | essential
Facets:
value: for humans
type: OTHER
value: to human health
type: TRANSITIVE-OBJECT
Source sentences:
text: They are a major source of energy, as well as containing essential amino-acids, such as lysine, tryptophan, methionine, leucine, isoleucine and valine, which are essential to human health, but which the body cannot synthesize.
text: Nine proteinogenic amino acids are called "essential" for humans because they cannot be produced from other compounds by the human body and so must be taken in as food.