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There are trillions of cells making up the various organs and tissues of the human body. The vast majority of them arise during embryonic development from a single cell, the zygote. Embryonic development is a complex process in which cells proliferate and divide following a very controlled genetic process that we have acquired through millions of years of evolution. A remarkable fact is that this cell proliferation does not end in adulthood. There are still cells capable of dividing, such as the hematopoietic cells that form white blood cells to protect us from infectious agents or red blood cells which carry oxygen to the tissues and carbon dioxide from the tissues to the lungs. But no matter how good machinery is, soon or later it can fail. And unfortunately cells are no exception....