Embryo The developing human organism from the implantation of the fertilized ovum in the uterus, about two weeks after conception to the eighth week after conception. The embryonic period of fetal development is one of rapid growth when the major organ...

(from Greek, en: in, bryein: to swell) An organism in the earliest stages of DEVELOPMENT. During the first 4 weeks of human development the apparently homogenous egg becomes an EMBRYO. Once the principal organs of the body are differentiated and...

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A majority of couples with stored embryos from fertility treatments say they would be willing to donate unused embryos for stem cell research, says a doctor who surveyed patients."Large numbers of infertility patients ... support using embryos for research, and these are people who have...

A British woman left infertile after being treated for ovarian cancer has no right to frozen embryos against the wishes of her former fiance, who provided the sperm, the European Court of Human Rights ruled Tuesday.The court's Grand Chamber, a panel of 17 European judges,...

Scientists proposed a new theory this week for how identical twins are formed as embryos, in a discovery that may improve a broad range of artificial reproduction techniques.Using specialized computer software to take photos every two minutes of 33 embryos growing in a laboratory, Dr....

An older woman's slim chances of getting pregnant could be made worse if embryos are screened for defects before being implanted into the womb, doctors said Wednesday.Pregnancy and live birth rates were substantially lower among women whose embryos were screened compared with those whose were...