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Because the Body can synthesized on its own
Alanine is non essential amino acid because it is synthesized by body.
Arginine is synthesized by mammalian cells but at a rate that is insufficient to meet the growth needs of the body and the majority that is synthesized is cleaved to form urea. Methionine is required in large amounts to produce cysteine if the latter amino acid is not adequately supplied in the diet.
Alanine is derived from food sources.Ourbody cannot synthesis alanine.So it is called non essential amino acid.
