<prompt> Semiessential amino acid is:ArginineLysineGlycinePhenylalanine  <response>: Essential, semiessential and non essential amino acids.Essential: Those amino acids which cannot be synthesised in the body. Hence these amino acids are to be supplied in the diet. Semiessential: Growing children require them in the food, but not essential in adults. Nonessential: Amino acids which can be synthesised in the body, hence not required in the diet. 