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Related to blastocysts: Blastocystis hominis


A modified blastula characteristic of placental mammals.



blastodermic sac, a stage in the development of mammal embryos, including humans, that arises as a result of cleavage of the fertilized ovum. The blastocyst is a hollow sac. An aggregate of cells—a node, analogous to the blastula of other animals—is found on one side of it. The outer wall of the blastocyst forms the trophoblast.

References in periodicals archive ?
Blastocysts that served as a positive control were incubated in DNase I solutions (5 U/50 [micro]L).
Total mRNA from the single blastocysts was isolated using the Dynabeads mRNA Direct Kit (Dynal Asa, Oslo, Norway).
For differential staining of inner cell mass (ICM) and TE cell compartments, the blastocysts which had been stained by PI were incubated in Triton X-100 prepared in the base medium for 20 seconds.
Embryologists are increasingly realizing that chromosomally abnormal embryos can appear to be developing properly and look quite normal at the blastocyst stage.
However, the New York Times reported Kass wrote in an e-mail: "The age of human cloning has apparently arrived: today, cloned blastocysts for research, tomorrow cloned blastocysts for babymaking.
Once Hwang and his colleagues optimized experimental conditions, about 25 percent of the eggs reached the blastocyst stage.
14]C(U)-glucose, accumulation of ammonia after IVM, IVF and IVC and number of cells within blastocysts were investigated.
As the time approaches for the blastocysts to be implanted, the mother bear's blood contains more and more progesterone.
Because the cells grow and divide indefinitely in culture, very few blastocysts would be needed.
They suck the nucleus out of a blastocyst cell with a micro-pipette while holding it by suction under a microscope, then use this nucleus to replace that of an unfertilized ovum.
In May 2007, CCRM commenced this innovative, world first clinical study, which screens for all 23 pairs of chromosomes on a few cells removed from the blastocyst using a technique called comparative genomic hybridization (CGH).
Therefore, the present study evaluated whether these blastocysts could be used to derive pESCs and assessed the effects of deriving pES-like cells from IVF-aggregated blastocysts.