| http://www.w3.org/ns/prov#value | - In a specific embodiment, R2 represents an amino acid other than serine, threonine or cysteine or the amide thereof; in another specfic embodiment, R2 is more than one amino acid, the first amino acid in the sequence, which is attached to asp, being other than serine, threonine or cysteine, or the amide of any free carboxyl groups.
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