Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to Blastocyst: blastocyst transfer


A modified blastula characteristic of placental mammals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
All of the 3PN embryos could be achieved at blastocyst stage on day 5 or 6.
"Our findings confirm that interspecific blastocyst complementation is a viable method for kidney generation," said researcher Masumi Hirabayashi.
Researchers take blastocysts, the clusters of cells formed several days after egg fertilisation, from mutant animals missing specific organs and inject them with stem cells from a normal donor, not necessarily of the same species.
Currently, evaluating blastocyst morphology and preimplantation genetic screening/diagnosis (PGS/PGD) are the two methods used to select healthy embryos for implantation.
Then, the embryos (5 blastocyst: day 7) were placed in an Eppendorf tube containing 5 ul of 0.1% PBS-PVA and stored at -80AdegC (three replicates in each group) until RNA extraction.
There was no difference between reactions of fresh and frozen groups in both 2-cell and blastocyst embryos.
Numerous previous reports have shown that higher pregnancy rates have been observed with blastocyst transfer (Day 5) than with transfers of early cleavage stage (Day 2 or Day 3) embryos [12-14].
The blastocyst rate with LP-PDMS was similar to those of the group culture (control) and WOW (32% versus 38% and 15%, respectively; P>0.05).
It is possible to establish three different types of stem cells, including ES cells, from thes three cell types in the blastocyst.