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When the virus attacks, the body's natural defenses produce white blood cells. Now biologists have discovered how the virus can disarm those white blood cells, known as B cells. |
From:
VOA Learning English
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Time: 03:13 | More in News & Politics |
원문출처 : http://www.youtube.com/watch?v=FYZmGjWo-ts&feature=youtube_gdata
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