The first “genetically pure” bison produced from a cleansed and transplanted embryo was born in June, officials at the Bronx Zoo announced today. Now the zoo can expand its bison herd with only the purest samples of prairie cows.
Using stem cell technology, scientists have produced male and female mice from two fathers, a breakthrough that could conceivably allow same-sex couples to have their own genetic children.
The multi-generational technique combines genes from the chromosomes of two male mice and uses surrogate mothers, according to researchers at the M.D. Anderson Cancer Center at the University of Texas.
For the first time, scientists have used light pulses to control a living animal's heartbeat, in a breakthrough that could lead to a greater understanding of congenital heart defects and even optical pacemakers.
Researchers led by Michael Jenkins at Case Western Reserve University in Ohio placed a laser fiber a millimeter away from a two-day-old quail embryo's heart. Using laser pulses, they were able to pace the heart's contractions, with no apparent damage to the developing tissue.
Will we grow babies outside their mothers' bodies?
By Gretchen ReynoldsPosted 08.01.2005 at 2:00 pm 8 Comments
A fetus lives in a world of bubbles. In its earliest days, it’s shaped like one. Later, it floats in one-the squishy, enveloping amniotic sac. And eventually, if all goes well, the fetus releases one bubble of fluid, then another and another, like smoke signals, as it puckers and swallows and floats in the womb. It was the bubbles that first convinced Hung-Ching Liu two years ago that a baby might actually be grown outside its mother’s uterus.