Cytotoxicity was evaluated in HeLa, PC12 [54 (link)], originally purchased from Clontech Laboratories Inc., Cat. No. 630912) and SH-SY5Y cells [17 (link)] after 3 days of incubation with the test compounds by using a tetrazolium dye assay (XTT assay, AppliChem GmbH, Darmstadt, Germany).
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