The righthand image shows the blastocyst "hatching" (D) from the protective zona pellucida, which it has to do in nature to implant in the ... and the other from human (right).

In a first for UK scientists, human embryos have been genetically ... During IVF, of 100 fertilised eggs, fewer than 50 reach the blastocyst stage, 25 implant into the womb and only 13 develop ...

The fusion of sperm and egg gametes during human fertilization establishes ... lineages using appropriate signals. In utero, the blastocyst implants and all three embryonic germ layers are formed ...

Stem cell research has been a hotly debated issue for years already, but groundbreaking work utilizing stem-cell-grown human brain tissue ... able to be successfully implanted from their lab ...

The researchers were then able to observe it implant in mice - something that ... would be very useful to have a limitless supply of human blastocyst-like stage embryos to understand the relevant ...

The implanted blastocyst in the uterine tissue will be ... There are strong inherent difficulties associated with research on human pregnancy, including the associated ethical problems providing ...