Assertion: protein's acid | /r/HasProperty | needed for proper construction
Facets:
Source sentences:
text: Of the twenty amino acids needed for proper construction, eight are called essential amino acids for adults, nine for children, since the body cannot synthesize or make these for itself: histidine, isoleucine, leucine, lysine, methionine (which becomes cystine), phenylalanine (which becomes tyrosine), threonine, tryptophan, and valine.