テキスト比較ツール difff《ﾃﾞｭﾌﾌ》[[http://stemcells.nih.gov/info/basics/pages/basics1.aspx]] I. Introduction: What are stem cells, and why are they important? Stem cells have the remarkable potential to develop into many different cell types in the body during early life and growth. In addition, in many tissues they serve as a sort of internal repair system, dividing essentially without limit to replenish other cells as long as t
