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Defend and Repair
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Defend and Repair

The first layer of defense is the skin. It keeps out fungus spores, yeasts and bacteria. Sometimes bacteria penetrate the skin's defenses, white blood cells spring into action, swallowing up the invaders. Smaller attackers, the viruses are harder to destroy. They commandeer the cells' own apparatus to reproduce themselves. The blood's line of defense is a host of antibodies, each tailored to fight a particular virus. As soon as one is detected, the body steps up production of the particular type of defender, to defeat the intruding virus.

Length 30 min. Copyright 1994 $ 99.95
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