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The human body is a complex and highly specialized machine that has evolved over millions of years to adapt to its environment. It is comprised of many different systems that work together in harmony to maintain homeostasis, or a stable internal environment. One of the most fascinating aspects of the human body is its incredible ability to heal itself. This process is made possible by the presence of stem cells, which are undifferentiated cells that have the ability to develop into any type of cell in the body.