Bone marrow stem cells can switch roles to produce a protein that promotes growth of the cornea, the transparent layer of the eyeball, scientists have found.
科学家已经发现骨髓干细胞能够转化角色，产生一种蛋白。该蛋白能促进眼角膜(眼球透明层)的生长。
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LASIK eye surgery changes the shape of your cornea - the transparent membrane that arcs over your pupil and the colored part of your eye.