Researchers are attempting to make egg cells without human ovaries.
In 2016, two Japanese reproductive biologists, Katsuhiko Hayashi and Mitinori Saitou, made an announcement in the journal Nature that read like a science-fiction novel. The researchers had taken skin cells from the tip of a mouse’s tail, reprogrammed them into stem cells, and then turned those stem cells into egg cells. The eggs, once fertilized, were transferred to the uteruses of female mice, who gave birth to ten pups; some of the pups went on to have babies of their own. Gametes are the cells, such as eggs and sperm, that are essential for sexual reproduction. With their experiment, Hayashi and Saitou provided the first proof that what’s known as in-vitro gametogenesis, or I.V.G.—the production of gametes outside the body, beginning with nonreproductive cells—was possible in mammals. The mice that had descended from the lab-made egg cells were described as “grossly normal.”
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President for Sale - A survey of today's political ads.
On a mid-October Sunday not long ago sun high, wind cool-I was in Harrisburg, Pennsylvania, for a book festival, and I took a stroll. There were few people on the streets-like the population of a lot of capital cities, Harrisburg's swells on weekdays with lawyers and lobbyists and legislative staffers, and dwindles on the weekends. But, on the façades of small businesses and in the doorways of private homes, I could see evidence of political activity. Across from the sparkling Susquehanna River, there was a row of Democratic lawn signs: Malcolm Kenyatta for auditor general, Bob Casey for U.S. Senate, and, most important, in white letters atop a periwinkle not unlike that of the sky, Kamala Harris for President.
