目的：为保持胚胎干细胞的高度未分化状态，饲养层细胞成为胚胎干细胞体外培养中不可缺少的条件。
AIM: Feeder layer cells are the necessary condition to prevent the differentiation of embryonic stem cells cultured in vitro.
“活的不可培养（VBNC）”状态是细菌在不良条件下的一种生存方式。
The viable but noncuturable (VBNC) state is a survival strategy when bacteria are exposed to environment stress.
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