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  1. ...weak because of being old, the human body can overcome the infectious disease of the straining virus by oneself usually. In addition the smallpox is a kind of infectious disease caused...

    分類:科學 > 生物學 2005年06月12日

  2. ... strain , of chromosomes. When an error has occurred on one of the chromatin during replication, a single strain gap will be introduced. Rec A will bind to the single strain ...

    分類:科學 > 生物學 2006年11月14日