4.2. Cell Viability Assay
The viability of HaCaT cells was determined by MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay (Thermo Fisher, Waltham, MA, USA). The viability of Hs27 fibroblasts was determined via automated time-course imaging using Incucyte (Sartorius, Göttingen, Germany).