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Comparison of different strategies to quantitatively analyze proteins immunoprecipitated with Tyr(P)-specific antibodies. log2-transformed PTP1B KO/wild-type ratios of immunoprecipitated Tyr(P)-containing proteins were compared with the respective ratios of their Tyr(P) peptides upon further TiO2 enrichment. pTyr, phosphotyrosine; wt, wild type.
