Senescent fibroblasts were treated for 14 days with 8 μM biotinylated KB1541. Immunoprecipitation was performed using AccuNanoBead™ Streptavidin Magnetic Nanobeads (TA-1015-1; Bioneer, Daejon, Korea). The eluted proteins were applied on to an Ion Mobility Tandem Mass Spectrometer/Time-of-flight mass spectrometry (IM–MS/MS TOF) (LCQ Deca XP-Plus, Thermo Finnigan, San Jose, CA, USA). Data analysis was performed as previously described [54 (link)].
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