Marking or identifying biomolecule e.g. protein, comprises contacting biomolecule with a complex,

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The invention relates to a method for marking and/or identifying at least one biomolecule, in particular of a protein, a peptide, an antibody or a nucleic acid, wherein the biomolecule with at least one complex, chelate complex in particular, at least one element of the rare earths (" [...]") and contacted therewith for interaction, in particular for the reaction is brought, preferably with formation of a bond, in particular co-ordinate and/or covalent bond, preferably co-ordinate bonding, between, on the one hand, and, on the other hand, of the element of the rare earth complex biomolecule.