2.2. Cell culture
Human melanoma SK-MEL-28 cell line and human normal skin fibroblast CCD-
1064Sk cell line were from the American Type Culture Collection. Cells were culturedin DMEM (for SK-MEL-28) or IMDM (for CCD-1064Sk) (Sigma, USA) supplementedwith 10% heat-inactivated fetal bovine serum (FBS; Invitrogen
Corporation, Australia), 100 U/ml penicillin and 0.1 mg/ml streptomycin (Thermo
Scientific, Melbourne, Australia) and maintained in an incubator with 5% CO2 at
37 _C. Cells were used in experiments during the linear phase of growth at a passage
number of 20 or less.