For identifying the target protein of mAb 2E7, ARPE-19 cells (10 million) lysed with 0.5% NP40 lysis mix26 (link) were incubated with 2E7 mAb pre-bound to protein G-agarose beads (RepliGen) for 6 h at 4 °C. The recovered proteins were resolved on a SDS-polyacrylamide gel (12.5%) and visualized using Gel Code Blue Reagent (Thermo Fisher). Polypeptides migrating at 60 kDa and 50 kDa were excised and subjected to mass spectrometry proteomic analysis at Bioproximity, Inc (Chantilly, VA)31 (link).
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