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Identification of HCV NS5B protein phosphorylation sites. NS5B phosphorylated by PRK2 in vitro was resolved by SDS-PAGE, and the band corresponding to NS5B was excised and subjected to in-gel digestion using trypsin for tandem mass spectrometry. Spectra for the phosphopeptides in the digested HCV NS5B protein, LPINALSNpSLLR (A) and HHNLVYATTpSR (B), are shown.
