目的比较TRH、EGF与地塞米松对未成熟胎肺形态发育及表面活性物质水平的影响。

Objective To compare the effects of TRH, EGFand Dexamethasone(Dex)on the morphogenesis and the levels of premature fetal lungs.

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结论：胎鼠听囊细胞在体外自然培养条件下可以分化或者增殖为未成熟毛细胞。

CONCLUSION: in natural culture condition in vitro, otocyst cells of fetal rats can differentiate or proliferate to immature hair cells.

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