摘要 |
Provided is a set of mass labels, each mass label in the set comprising a mass marker moiety attached via a cleavable linker to a mass normalisation moiety, each mass label in the set having a common mass; wherein the set comprises a plurality of groups of mass labels, the mass of the mass marker moiety being the same for mass labels within a group, the mass of the mass marker moiety being different between groups; the mass marker moiety is capable of fragmentation into two or three fragments; and the mass of at least one fragment of the mass marker moiety differs between mass labels within a group.
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