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__Protein!__
==What exactly is protein? Protein builds up, replaces, and maintains tissues in the body. Your immune system, muscles, and organs are made mainly of protein. Protein is very important for your body's wellbeing. Your body uses protein to make a substance called hemoglobin, the part of the red blood cell that carries oxygen all over your body. To watch a video about nutrition and protein, check out: [].==

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