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A hypervariable region 3' to the human apolipoprotein B gene.

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  • Chemistry


The National Institute of Environmental Health Sciences Making it in a Tough EnvironmentMaking it in a Tough Environment your genes. 2 Lots of things in our homes and schools and workplaces — and in wild and natural places — can cause harm sometimes. Why "sometimes"? The harm may depend on who you are — as well as what you do, what you are exposed to, and when. Big, muscular people look as if they can resist anything. But they can have allergies or asthma, or be injured by chemicals, too. And the bigger they come, the more skin the sun can burn! Most of us, for example, can get sunburned on a bright day. Your reaction will be greater if you are outside, without much on, for a long time. Your reaction will be less if you cover your exposed skin with lots of sun screen. How bad you burn can depend on your age and previous exposure. (Babies and toddlers need a lot more protection.) Finally, if one or both of your parents burn very easily, they may have passed that sensitivity to you in Designer Genes — They’re the Boss Genes are the instructions — the marching orders — that direct our growth, what we look like and how we react to things in our world, or environment. Each human — whether infant, child, teen or adult — has thousands of pairs of these orders, or genes. They tell our bodies' cells what to be and how to behave. Do you remember transformer toys? You twisted them one way and they were space ships. You twisted them another way and they became robot warriors. Well, under the genes' orders, the cells become the ultimate in transformer robots. The genes instruct our original dab of cells, as they divide, to become different — muscle, bone, lung, or brain cells, or part of a toe. As a result of what the cells become and do, we grow. And we stand and run and catch footballs and dance — more or less with grace and skill. We breathe. We think! Our genes, or instructions, are coded on short segments of a long chem

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