Isotopically-labelled non-radioactive peptides function as critical internal standards for protein quantitation experiments in MS and NMR experiments. Thermo Fisher Scientific now offers multiple grates of heavy peptides, enabling researchers to match the precision and cost of the internal standard according the assay development stage. The new HeavyPeptide Aqua Ultimate kit is designed for absolute quantification and the Aqua Quant Pro kit is a more affordable alternative when ultimate precision is not necessary.

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