About 37-51 d,the quantity of oogonia grows rapidly and the synplasma-like oogonia can be found in this stage.
结果表明,绵羊胎儿在37 d,可以从外观上分辨雌雄,雌性胎儿的性腺初步出现卵巢的组织学特征;37-51 d为卵原细胞的共质体期,卵原细胞数量增长加快;55~76 d卵巢中逐渐充满大量的合胞体样卵母细胞群;从58 d开始卵巢皮质深层出现少量的形态不典型的原始卵泡。
Objective To observe the inductive efficiency of deriving hematopoietic cells from human embryonic stem(hES)cells co-cultured with human yolk sac stromal cells,fetal liver stromal cells or fetal bone marrow stromal cells,in order to discuss the effect of the different hemopoietic microenvironment on hemopoietic cytogenesis.
目的:通过观察人卵黄囊基质细胞、人胎肝基质细胞和人胎骨髓基质细胞对人胚胎干细胞向造血细胞分化诱导效率,探讨不同造血微环境对造血发生的影响。
