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  2. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    Although various definitions of acids and bases are used in chemistry, the only one that is useful for chemistry in aqueous solution is that of Brønsted: [37] [38] an acid is a species that can donate a proton to another species, and a base is one that can accept a proton. This criterion is used to label the groups in the above illustration.