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Description
They are categorized as essential and non-essential, where the essential amino acids are the type that cannot be synthesized within the human body and thus need to be supplied to the body from exogenous sources to keep up the process of protein biosynthesis [2]

doi: 10.1007/s00726-010-0523-5 97 ParkY.-J.KoJ

Ogunniyi Kayode E
Huang H, Zhu S, Liu D, Wen S, Lin Q
