THE SPERM THAT NEVER DIES

BY REMOVING AND FREEZING TESTICULAR CELLS, DOCTORS MAY BE ABLE TO BESTOW BIOLOGICAL IMMORTALITY

Imagine a mouse impregnating a rat, a bull impregnating a horse, a deer impregnating an elephant. Imagine a man fathering a child--or 100 children--a century after his death. Sound preposterous? Think again. A team of scientists at the University of Pennsylvania and the University of Texas Southwestern Medical Center has taken the first tiny steps toward scenarios at least as bizarre, and perhaps even more so. Writing in the current issue of Nature Medicine, the researchers report that they have frozen spermatogonial stem cells--the cells that make sperm--thawed them and coaxed them back to life. And in a companion paper in...

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