目的：比较载杆玻璃化冷冻法与程序冷冻法对人早期胚胎冷冻复苏的效果。

Objective To compare the outcome of the vitrification using cryotop to the slow-freezing method for human cleaved embryos cryopreservation.

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在胚胎发育期，胎儿通过新血管化过程(其内皮细胞源于祖细胞)和新生血管形成过程(新血管由旧血管芽生而来)生成毛细血管。

During embryogenesis, capillaries develop in the fetus by neovascularization, where endothelial cells arise from progenitor cells; and angiogenesis, in which new blood vessels sprout from old ones.

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