| http://www.w3.org/ns/prov#value | - herein also provides a labeled target comprising T--L--M [0079] wherein T is a target, M is a marker moiety and L is a chemical group covalently linking the M to T, the chemical group L comprising a backbone that comprises at least two consecutive peptide bonds. [0080] Another aspect of this invention is a labeling reagent comprising R--L--M [0081] wherein R is a reactive group, M is a marker moie
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