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  1. ...ability to divide and differentiate into other cell types. Stem cells have the ability to act as a repair system for...and differentiate, replenishing other cells as long as the host organism is alive. 2.還有幹細胞是可以...

    分類:科學 > 生物學 2006年04月20日

  2. ... quite short at the beginning of the night and longer at the end. It is common to wake for a short..., certain neurons in the brain stem , known as REM sleep-on cells (...

    分類:科學 > 生物學 2005年08月22日