n.胞胚；囊胚
The cells of the blastula, called blastomeres, also each receive a full diploid set of chromosomes. 这些囊胚细胞，称卵裂球，每个细胞都有一套二倍体染色体组。
Cleavage produces a blastula, a sheet of cells rounded into a sphere that in most species surrounds a cavity. 卵裂产生一个囊胚，形成的细胞壁球形排列形成一个空腔。
