medullary tube是什么意思 medullary tube怎么读
medullary tube的用法和样例
- These are not derived from the neural crest, instead an outpouching of the neural tube generates the optic cup which, in turn, forms the retina.
不过视网膜上皮的黑色素细胞是其中的例外，它们并非由神经脊产生，而是在神经管外囊生成的视杯产生。
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