A new embryo starts as a single cell with perfect symmetry.
胚胎是从一个完美对称的单细胞开始的。
Developmental program — The process by which a cell in an embryo achieves its fate.
胚胎中的未分化细胞按被定型的命运不可逆地发育成特定类型细胞的过程。
The 2-cell embryo rate of direct culture group (86.4%) has no obvious difference in co-culture group (88.7%).
非共培养的2-细胞胚胎比率（86.4%）与琼脂包埋培养的2-细胞胚胎比率（88.7%）相比差异不显著；
The 2-cell embryo rate of direct culture group (86.4%) has no obvious difference in co-culture group (88.7%).
非共培养的2-细胞胚胎比率（86.4%）与琼脂包埋培养的2-细胞胚胎比率（88.7%）相比差异不显著；
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