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Amino Acids with Alcohol Serine (SER) (a - amino b - hydroxy propionate) Threonine (THR) (a - amino b - hydroxy butyrate) NH3 + C COOH CH2 OH N H3 + C COOH CH3 CH O HAmino Acids with Alcohol Serine (SER) (a - amino b - hydroxy propionate) Threonine (THR) (a - amino b - hydroxy butyrate) NH3 + C COOH CH2 OH N H3 + C COOH CH3 CH O H