The Passage Reagent Group™ (PRG) is a matched set of Cell Systems Certified™ reagents for releasing cells from culture for subculture or freezing. The PRG contains three parts: PRG-1™ (EDTA -dPBS Solution), PRG-2™ (Trypsin/EDTA -dPBS Solution), and PRG-3™ (Trypsin Inhibitor-dPBS Solution). The chelating agent EDTA in PRG-1™ prepares for PRG-2™, which contains highly purified trypsin. PRG-3™ inactivates the protease in PRG-2™ and stabilizes the cell membranes.