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Histogram illustrating the ability of CE–MS to identify low-abundance proteins. Absolute abundances of 3 868 proteins were taken from Ghaemmaghami et al.41 and compared to the proteins identified by CE–MS. Proteins were included in this graph only if they were identified by detection of at least 2 unique peptides. A total of 615 proteins identified by CE–MS could not be allocated due to missing absolute protein abundances in the literature.
