性细胞遗传的

In addition, we presume that the role of different MMPs is distinct in various stages of EMs development. The difference of subjects which is resulted by the genetic difference of MMP-1 has the association with the risk of EMs, and the abnormal expression of protein may have relation with the development of EMs; The abnormal expression of MMP-3 has a very important role in the development of EMs; As a protein of endothelial expression, MMP-7 may participate in the development of EMs, endometrial cells with high-expression MMP-7 easily take place ectopic implantation in the blood of menstruate countercurrented and increase the risk of EMs; It is not confirmed in our study that there are the association of MMP-9 with the risk of EMs, but in view of other study, we will further evaluate the role of MMP-9 in the development of EMs.

且推测不同的MMPs基因在子宫内膜异位症发生和发展的不同阶段作用不同，MMP-1基因的遗传差异所导致的个体差异与子宫内膜异位症发病风险的个体差异相关，其蛋白的异常表达还可能与子宫内膜异位症的进展相关；MMP-3基因的异常表达在子宫内膜异位症的发展中起重要作用；MMP-7作为一个上皮性表达的蛋白，可能对子宫内膜异位症的发生起重要作用，带有MMP-7高表达的在位子宫内膜细胞更易在经血逆流中"异位"种植，增加个体子宫内膜异位症的发病风险；MMP-9虽然在本研究中没有被证实与子宫内膜异位症的发生和发展有相关性，但鉴于其它相关研究，有待于从其它方法证实MMP-9在子宫内膜异位症进展中的作用。

For further studying the genetic mechanism of the reproductive isolation phenomenon of interspecific hybrid, paraffin sections of testes from 13 sexually mature male mules (Equus asinus×Equus caballus) and 12 hinnies (Equus caballus×Equus asinus) were prepared, and the samples of Giemsa meiosis and AgNO 3 synaptonemal complexes were observed and compared with spermatocyte meiosis of horse and donkey under light microscope and electronic microscope.

为了进一步探讨种间杂种生殖隔离现象的遗传机理，本研究采用性成熟公骡的睾丸为材料，制备组织切片和减数分裂联会复合体标本进行观察，发现个别性腺发育较好的个体虽然减数分裂存在大量异常，但确有少数精母细胞完成了减数分裂并产生精子。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。