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With the advance of mass spectrometry based proteomics techniques, thousands of phosphorylation sites can be identified from a single cell line or a single tissue sample by large scale global analysis. However, such large scale analysis is time consuming. And, due to the high complexity of the phosphoproteome sample, this approach is often unable to identify low abundance regulatory phosphorylation...
In theory, proteases with broad cleavage specificity could be applied to digest protein samples to improve the phosphoproteomic analysis coverage. However, in practice this approach is seldom employed. This is because the identification of phosphopeptides without enzyme specificity by conventional database search strategy is extremely difficult due to the huge search space. In this study, we investigated...
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