One thousand PCCs or PSCs per well were plated in triplicate into 96‐well plates with DMEM containing 10% FBS for 24 h. After cellular adhesion to the plates, the medium was replaced with fresh DMEM containing 10% FBS plus calpeptin at 0 (DMSO), 10, 20, 40, 60, or 80 μM (day 0). Cell viability was determined with a CellTiter‐Glo luminescent cell viability assay kit (Promega, Madison, WI, USA) according to the manufacturer's instructions on days 0–4 every 24 h.
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