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简述神经管的两种形成方式?

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神经嵴分为哪几类?举例说明各自的分化方向?

简要叙述神经管管壁在大脑皮质区的分化情况?

简述视网膜的形成过程。

The history period for the story in the film is 1960’s America, the period in which _______was still in clashes frequently.

A. slavery
B. prejudice
C. racial discrimination
D. freedom

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