bell stage的意思|示意

RESULTS: The expression of MMP-2 could be found in bud stage , cap stage and later time of bell stage.

结果：牙胚发育过程中的蕾状期、帽状期、钟状晚期基质金属蛋白酶- 2 （MMP - 2 ）均有表达，但以钟状期前牙本质细胞的表达最明显。

Conclusion: Shh and its receptor are expressed during the late bell stage of mouse tooth germ.

结论: Shh及 其受体Ptc在小鼠牙胚钟状晚期有表达.

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The yield of two times of the fertilizer application at bell stage was similar to that of one time.

拔节期和大喇叭口期分两次追施和大喇叭口期一次施入产量相近。

Conclusion: Shh and its receptor are expressed during the late bell stage of mouse tooth germ.

结论：Shh及其受体Ptc在小鼠牙胚钟状晚期有表达。