The inpocketed vegetal pole cells develop into a sheet of cells which grows upward and eventually encloses a cavity, the archenteron.
内褶的植物极细胞生片向上生长的细胞,并最后围腔,即原肠。
The inpocketed vegetal pole cells develop into a sheet of cells which grows upward and eventually encloses a cavity, the archenteron.
内褶的植物极细胞生片向上生长的细胞,并最后围腔,即原肠。
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