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There are millions of proteins. And the specific types of proteins that you have make you who you are. If you have brown hair, you have the brown pigment protein. If you are a plant, you have the chlorophyll protein. We have to have the right proteins in the right cells. How is that possible? We have to use our genetic code to do all this. That is our DNA.
So, you have to have a plan for making the protein, and that plan comes from your DNA, the hereditary material in your cells that makes you who you are. We have to be able to take the DNA and use its information to make protein.
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