Word: uterus
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...Steptoe extracted an egg from one of Lesley's ovaries, and placed it in a laboratory dish. Edwards then fertilized the egg with John Brown's sperm. Two and a half to three days later, when the egg had undergone three cell divisions, it was placed in Lesley's uterus. Said Edwards about Baby Louise: "The last time I saw her, she was a beautiful eight-celled embryo...
...Steptoe hopes that "in a reasonable number of years, instead of this being a one-day wonder or a seven-day wonder, it'll be a reasonably commonplace affair." Nevertheless, said Edwards, a great many questions remain to be answered, the chief one being why the uterus accepts or rejects the test-tube embryo. Said he: "This is the first time we've solved all the problems at once. We're at the end of the beginning?not the beginning...
...shortly before, it is ready for implanting. One way this can be done is by picking up the egg, which is still no bigger than the dot at the end of this sentence, with a tiny hollow tube, or pipette, then inserting it through the cervix and into the uterus. If all goes well, it will implant itself in the uterine wall. At least a week must pass before the doctors know if the patient is indeed pregnant...
...After the woman receives further hormone treatment to prepare the uterine lining, the blastocyst is placed in the uterus, where it attaches to the wall and normal embryo development proceeds-as it would from a natural conception...
...distinct sacs, called pronuclei. Using microsurgery, Markert removes either pronucleus. The egg is then exposed to a chemical that causes the remaining pronucleus to replicate, thus giving the cell a full complement of genes. Then the cell itself divides, and the resulting embryo is placed in the uterus of a female mouse to develop. Using this technique, Biologist Peter C. Hoppe of Jackson Laboratory in Bar Harbor, Me., and Swiss Microsurgeon Karl Illmensee have produced seven mice, all females. (Males cannot be produced by this method because the male and female pronuclei never merge, making it impossible for the male...