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Developmental Biology 辐射型全卵裂 海鞘:经一经一纬一经…,8次分裂后产生的256细胞 柱形胚胎在两极细胞移动封口后成为中空柱形囊胚。 Meridional Animal polecleavage Equatorial ne deava age pLane Figure 5.2 Holoblastic cleavage in the echinoderm Synapta digita, leading to the formation of a hollow blastula, as shown in the cutaway view in the last panel (After Vegetal pole Saunders, 1982) Hollow blastula (cut opeDevelopmental Biology 辐射型全卵裂 海鞘:经-经-纬-经……,8次分裂后产生的256细胞 柱形胚胎在两极细胞移动封口后成为中空柱形囊胚
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