在此之前，科学家相信特化细胞不能被用来形成完整的生命体。
Until now, scientists believed that specialized cells could not be used to form a complete living thing.
心脏前体的特化是组织间及细胞与细胞之间相互作用的结果，这一过程包含了诱导信号作用的时间和空间完整程序。
The specification of heart precursors is a result of multiple tissues and cell-cell interactions that involve temporally and spatially integrated programs of inductive signaling events.
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