The melanoma cells are placed in special magnetic test chambers that create a 0.7 T magnetic field, quantitative reverse transcription-polymerase chain reaction (RT-qPCR) is used to examine the antioxidant enzymes at mRNA levels, and the activities of superoxide dismutase (SOD), glutathione peroxidase (GPx), and catalase (CAT) are assessed in the cell lysates. The gene discussed is CAT; the disease is melanoma.