Semiessential amino acid -
Essential amino acids inclide leucine,isoleucine,lysine,methionine,phenylalanine,threonine,valine,tryptophan.Histidine is an essential amino acid.(Ref.PARK'S textbook of social and preventive medicine 21st edition page no.562)
Alanine
Valine
Histidine
Tyrosine
Nutrition and health