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Eye Cancer: Intraocular Melanoma What is intraocular melanoma? Melanoma is a serious kind of skin cancer. This cancer starts in cells called melanocytes. These cells make the pigment that colors your skin. You also have melanocytes in your eyes. When these cells become cancer, it

Medical Genetics: Types of Genetic Changes The human body has about 20,000 different genes in each cell. Genes are located on chromosomes, which are stick-shaped structures in the middle of the cell (nucleus). Each cell usually has 46 chromosomes grouped in 23 pairs. Each gene