The heart is the first organ to form during embryogenesis.
心脏是胚胎发育过程中最先形成的器官。
The functions of some of these genes during embryogenesis have been studied in details.
我们也已经具体研究过一些基因在胚胎形成过程中的功能。
During embryogenesis and crown root formation, QHB expression was observed prior to the morphological differentiation of the root.
在胚发育和冠状根形成过程中，QHB在根的形态分化之前就已经表达。
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