blastula
Embryonic stem cells are taken from a blastocyst - a ball of cells that develops within a few days after an egg has been fertilized by a sperm.
There are ethical issues raised by these treatments, such as the disposal of healthy blastocysts.
The study concerned the production of viable bovine blastocysts in vitro.
They looked at the effect of maternal age on early human embryonic development and blastocyst formation.

SMART Vocabulary: related words and phrases

Animal reproduction
androgen
anti-oestrogen
asexuality
asexually
barrenness
calve
fertile
impregnate
oestrogen
ovulate
panmictic
panmixia
procreate
procreation
procreative
propagation
rut
semen
spawn
sterile

You can also find related words, phrases, and synonyms in the topics:

Cells

Examples of blastocyst

blastocyst
Maternal undernutrition during the preimplantation period of rat development causes blastocyst abnormalities and programming of postnatal hypertension.
Perhaps surprisingly, no regional differences in calcium gradients could be detected around blastocysts.
Investigation into the degree of cell mixing that occurs between the 8-cell stage and the blastocyst stage of mouse development.
Those changes continue and progress until blastocyst formation.
The proportion of morulae plus blastocysts obtained was similar among groups.
The proportion of morulae plus blastocysts was not affected by cysteamine concentration or oocyte type.
Culture and transfer of humane blastocysts increases implantation rates and reduces the need for multiple embryo transfers.
In our study, the toxicity of nocodazole on mouse embryo development was determined based on both blastocyst formation and the number of blastomeres.
At the end of culture, the ratio of blastocysts formed was recorded and the number of blastomeres per blastocyst was counted.
Results obtained in this species are somewhat contradictory and in most studies have not taken into account the quality of the blastocysts produced.
The majority of dead blastomeres in such treated mouse blastocysts were apoptotic.
We found that blastocysts exhibit oxygen gradients with maxima twice that surrounding zygotes.
Physiological characterization of blastocyst hatching mechanisms by use of a mouse antihatching model.
Successful piglet production after transfer of blastocysts produced by a modified in vitro system.
However, developmental rates to blastocyst stage are still limited.
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