| http://www.w3.org/ns/prov#value | - In some embodiments, an amino acid is a synthetic amino acid; in some embodiments, an amino acid is a D-amino acid; in some embodiments, an amino acid is an L-amino acid. ???Standard amino acid??? refers to any of the twenty standard L-amino acids commonly found in naturally occurring peptides. ???Nonstandard amino acid??? refers to any amino acid, other than the standard amino acids, regardless o
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