All of the following are essential amino acids except
Alanine is a non-essential amino acid .essential amino acids are threonine valine tryptophan isoleucine lysine proline methionine (TV TILL 8 PM).they are not synthesized by humans.they are required for our normal growth.Ref: DM Vasudevan - Textbook of Biochemistry for Medical Students, 7th edition, page no: 27
Methionine
Lysine
Alanine
Leucine
Metabolism of protein and amino acid