| In the pregnant cow, the conceptus must inhibit the release of uterine PGF 2alpha so that the corpus luteum continues to secrete progesterone and pregnancy can be established. |
| However, the error rate in a genetically modified or cloned conceptus is potentially so high that such applications should never be approved by any science ethics committee. |
| And indeed biologists tend to talk about the embryo before that, as a conceptus or a pre-embryo. |
| Indeed it will be several weeks before a nervous system develops that could allow the developing conceptus to feel pain or be aware. |
| Thus the difference in susceptibility to RDS in premature singletons and multiples may depend on the size of the conceptus. |
| These key steps include angiogenesis and protection of the conceptus from immune responses. |
