| Preclinical models for human pre-embryo biopsy and genetic diagnosis. |
| And indeed biologists tend to talk about the embryo before that, as a conceptus or a pre-embryo. |
| It is therefore plausible that non-barrier contraceptives may act at the level of the pre-implantation pre-embryo. |
| Implantation of the pre-embryo in the uterine wall is a highly invasive process, akin to attack by a parasite. |
| Before fourteen days, the embryo, or pre-embryo as it was scientifically known, was a loose cluster of first two, then four, then sixteen cells, undifferentiated. |
| The term pre-embryo has been embraced wholeheartedly by practitioners for reasons that are political, not scientific. |
