FSCs pump out laminin A, and the scientists found that mutant cells that were unable to make the protein broke their moorings and reproduced sluggishly.

• 卵囊干细胞排出层粘连蛋白A，科学家发现这种突变细胞不能使蛋白质切断它们与宿主细胞联系并且繁殖缓慢。