It is concluded that the initial ancotomic site of blood island genesis may be is mesoblast of extraembryonic blastoderm rather than the yolk sac; the blood vessel endothelium cells and the blood cells are generated parallel; the PGCs are the common ancestry of angioblast and HSC.

血島最早發(fā)生的解剖位置可能不是卵黃囊而是胚外胚盤中胚層久久久国产99精品一国产，血管內(nèi)皮細(xì)胞與血細(xì)胞平行發(fā)生，PGC是成血管－造血干細(xì)胞的共同祖先。

Result The embryonic development of Silnrus asotus in Dongting Lake was divided into 7 stages, namely, blastoderm stage, cleavage stage, blastula stage, gastrula stage, neurula stage, organogenesis stage and pre-hatching stage.

結(jié)果］洞庭黃鯰的胚胎發(fā)育過程可分為胚盤期、卵裂期日韩黄片点结进入、囊胚期、原腸期操h网站、神經(jīng)胚期99在线视频精品、器官形成期和出膜期7個(gè)階段。

The cells of blastomere randomly distributed either embryonic parts or extraembryonic parts of blastocyst.

2-細(xì)胞胚胎卵裂球隨機(jī)分布在囊胚的胚胎部分和胚外部分射射射操操操。

BACKGROUND: Presently, the method of establishing human embryonic stem cells mainly contains blastula method, nuclear transplantation method and embryo blastomere method.

背景：目前人胚胎干細(xì)胞建系的技術(shù)路線主要有囊胚法在线无码第一区亚洲第一页、核移植法和胚胎單卵裂球法，但由于破壞胚胎在线的免费黄色网站插，涉及諸多倫理問題。

The modified blastula that is characteristic of ''.

胚泡轉(zhuǎn)化的囊胚91精品自在拍精选久久，為胎盤哺乳動(dòng)物的特征

The modified blastula that is characteristic of placental mammals.

胚泡轉(zhuǎn)化的囊胚精品久久久久久电影，為胎盤哺乳動(dòng)物的特征

The in growth and curl in g in ward of a group of cells,as in the formation of a gastrula from a blastula.

內(nèi)長一組細(xì)胞的內(nèi)部或向內(nèi)生長，如從囊胚到原腸胚的生長過程

The ingrowth and curling inward of a group of cells,as in the formation of a gastrula from a blastula.

內(nèi)長一組細(xì)胞的內(nèi)部或向內(nèi)生長免费看的黄色视频，如從囊胚到原腸胚的生長過程

The outer layer of a blastula that gives rise to the ectoderm after gastrulation.

外胚層囊胚的外層99riav1com，在原腸胚形成之后生后外胚層組織

The cells of the blastula called blastomeres also each receive a full diploid set of chromosomes.

這些囊胚細(xì)胞，稱卵裂球日韩成年黄网站视频，每個(gè)細(xì)胞都有一套二倍體染色體組欧美在线1区。