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The rest are non-essential amino acids that aren't used or "extra" essential amino acids that couldn't be paired

Edwards K, Jackson H, & Jones AR (1970) Studies with alkylating esters-II: A chemical interpretation through metabolic studies of the antifertility effects of ethylene dimethanesulphonate and ethylene dibromide

M.VillmannC.et al (2018)

Extraintestinal manifestations of celiac disease: effectiveness of the gluten-free diet

In examining the cell cycle, the number of cells in the G1, S, and G2/M phases of the cell cycle is determined according to the amount of cellular DNA in the examination of the cell cycle in the conditions without the use of X-rays, the number of cells arrested in the G1 phase was high in all treated groups