Please choose the correct ending to complete the given sentence: Health: [header] How to prevent melanoma [title] Limit your exposure to the sun. [step] Melanoma begins in your body's melanocytes (the cells responsible for producing your body's pigment or color). Ultraviolet rays from the sun interact with these melanocytes, causing them to produce a dark protective pigment.

Ending1: If your melanocytes are overexposed to ultraviolet rays, melanoma can begin to form. Malignant tumors are a result of cumulative cellular effects of uv light and inability of skin to mount a defense to it. Ending2: For this reason, make sure that you do not expose these cells in direct sunlight. [substeps] There are several safer ways to protect melanocytes by limiting your exposure to the sun. Ending3: Therefore, the best way to protect your melanocytes is by reducing the amount of sun exposure you choose to allow the melanocytes to form. [substeps] Apply sunscreen daily to protect yourself from the sun in summer. Ending4: When you are exposed to all sorts of ultraviolet radiation, it leads to melanation, which is an autoimmune reaction that causes melanoliculitis. Because of this, you can prevent melanomas by spending time in an environment that is away from sunlight.

Answer format: ending1/ending2/ending3/ending4