常見例句That is, the growth cones collapsed. 2. In the 4th embryonicday (E4), sema 3A mRNA was expressed around the neural tube and atthe notocord. 在雞胚發(fā)育的第 4天（E4），Sema 3A InRN表隂神經(jīng)琯周圍和脊索。 返回 notocord