*4.2. Cell Lines*

Normal mouse epidermal cells JB6 Cl41 (ATCC® no. CRL-2010™), human colorectal carcinoma HT-29 cells (ATCC® no. HTB-38™), breast cancer MDA-MB-231 cells (ATCC® HTB-26™), and melanoma SK-MEL-28 cells (ATCC® no. HTB-72™) were obtained from the American Type Culture Collection (Manassas, VA, USA).
