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Trends Biochem Sci. 2006 Aug;31(8):473-84. Epub 2006 Jul 11.

Relative quantification in proteomics: new approaches for biochemistry.

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Stem Cell and Leukaemia Proteomics Laboratory, University of Manchester, Kinnaird House, Kinnaird Road, Withington, Manchester, M20 4QL, UK.


Recent developments in mass spectrometry and protein arrays provide opportunities to derive systematically proteomic information from small samples of cellular material. Relative quantification among samples can be achieved with either gel-based or gel-free approaches. Furthermore, the adaptation of specific techniques facilitates absolute quantification. Here, relative quantification in two-dimensional gel electrophoresis is contrasted with that in non-gel-based approaches such as isobaric tagging of peptides, pre-labelling of living cells with isotopomeric forms of essential amino acids and protein array platforms. In addition, novel flow-cytometry-based approaches are considered. These technologies can all be used to determine accurately the levels of proteins or biomarkers in a wide range of samples.

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