雌性生殖细胞形成过程中经过两次减数分裂，形成一个大形的单倍体卵细胞和2～3个小形的细胞，这些小形的细胞称为极体。
The experiment results showed that expansive ratcs of cumulus cells were 80.65, 86.00, 85.40 and 85.71％ respectively in 4 groups, there were no significantly diflbrents between groups（p<0.05）; releasing rates of first polar body（PbI） were 16.47, 7.41, 12.28 and 19.23％ respectively, the second group was significantly lower than the others （p<0.05）.
第一极体放出率分别为16.47％、7.14％、12.89％和19.23％。 第二组低于其他各组,但差异不显著（P>0.05）。
参考来源 - 家兔卵巢卵母细胞体外成熟和体外受精的初步试验The rate of oocytes extruded the first polar body（PB1）could be significantly improved in the maturation medium supplemented with 10 ng/mL insulin like growth factor I（IGF-I）.
在成熟液中添加10ng/mL胰岛素样生长因子（IGF-I）显著提高猪卵母细胞的第一极体排出率。
参考来源 - 猪体细胞核移植相关技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
前言：目的：建立采用第一极体植入前染色体非整倍体诊断的方法。
Objective: To establish the method of preimplantation genetic diagnosis (PGD) by use of first polar bodies.
卵丘-卵母细胞复合物各组的卵母细胞生殖泡破裂发生率和第一极体排除率明显高于裸卵各组（P<0.05）。
Percentage of undergoing germinal vesical breakdown and PB1 extrusion in cumulus-oocyte complex groups was higher than that in denuded oocyte groups(P<0.05).
结果表明海狸鼠卵母细胞与其它啮齿动物的卵母细胞一样，能够在体外培养成熟，完成第一次减数分裂，排出第一极体。
The results indicated that nutria oocytes, like other rodent oocytes, can be matured in vitro, complete first meiotic division and discharge first polar body.
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