LC-MS grade water, methanol, acetonitrile, and isopropanol were all purchased from Merck (Darmstadt, Germany). Formic acid, dimethyl sulfoxide (DMSO), potassium phosphate dibasic (K2HPO4), potassium phosphate monobasic (KH2PO4), and bovine serum albumin (BSA) were acquired from Sigma-Aldrich (Buchs, Switzerland).
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