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Amino acids are defined by two functional groups: An amino group and a carboxylic group. Both groups can donate/accept protons under specific pH conditions. At a neural pH (7.0) amino acids exist in the zwitterionic form of NH3 + and COO-.
By A J Ghalayini, Ph.D.Amino acids are defined by two functional groups: An amino group and a carboxylic group. Both groups can donate/accept protons under specific pH conditions. At a neural pH (7.0) amino acids exist in the zwitterionic form of NH3 + and COO-.

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