#essential_amino_acid__essentialaminoacid  an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet
  supertype:  #amino_acid__aminoacid__aminoalkanoic_acid__aminoalkanoicacid  organic compounds containing an amino group and a carboxylic acid group; "proteins are composed of various proportions of about 20 common amino acids"
  subtype:  #arginine  a bitter tasting amino acid found in proteins and necessary for nutrition; its absence from the diet leads to a reduced production of spermatozoa
  subtype:  #histidine  an essential amino acid found in proteins that is important for the growth and repair of tissue
  subtype:  #isoleucine  an essential amino acid found in proteins; isomeric with leucine
  subtype:  #leucine  a white crystalline amino acid occurring in proteins that is essential for nutrition; obtained by the hydrolysis of most dietary proteins
  subtype:  #lysine  an essential amino acid found in proteins; occurs especially in gelatin and casein
  subtype:  #methionine  a crystalline amino acid containing sulfur; found in most proteins and essential for nutrition
  subtype:  #phenylalanine  an essential amino acid found in proteins and needed for growth of children and for protein metabolism in children and adults; abundant in milk and eggs; it is normally converted to tyrosine in the human body
  subtype:  #threonine  a colorless crystalline amino acid found in protein; occurs in the hydrolysates of certain proteins; an essential component of human nutrition
  subtype:  #tryptophan__tryptophane  an amino acid that occurs in proteins; is essential for growth and normal metabolism; a precursor of niacin
  subtype:  #valine  an essential amino acid found in proteins; important for growth in children and nitrogen balance in adults

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