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In a bid to sidestep the ethical debate over the use of human embryos in medical research, scientists have developed a way to derive viable stem cell lines without harming the embryo.
They did so by extracting a single cell from the embryo — as in vitro fertilization clinics do when they test for genetic defects and introducing a common molecule called laminin to keep it in a stem cell, or pluripotent, state.
Subsequent development ...
Not nerve cells in particular, but another step forwardThe researchers took dead animal hearts and stripped them of everything except the blood vessels, valves and connective tissue. These scaffolds were then seeded with cells from newborn and foetal rat hearts and, after four days of growth, the organs started to contract. Within eight days, the hearts were beating.
While the excitement continues to swirl around the recent breakthrough of converting skin cells to stem cells, other researchers are quietly pursuing a new type of stem cell discovered in menstrual blood.
The technique for converting the skin cells involves using viruses to insert several genes, one of which is known to cause cancer.
Meng and Ichim's team had a hunch that stem cells may aid in the rapid expansion of the uterus lining during a ...
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