| http://www.w3.org/ns/prov#value | - 1, and R1 is a protected or unprotected terminal amino group and R2 is a protected or unprotected terminal carboxy group In a preferred embodiment, X1 is the peptide Ala-Arg-Arg-Ser-Ser-Pro-Ser-Tyr-Tyr and X2 is the peptide Gly-Ala-Gly-Pro-Tyr-Tyr-Ala-Met-Asp-Tyr.
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