Jeannie Phan for NPR

In Search For Cures, Scientists Create Embryos That Are Both Animal And Human

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Human stem cells, in this case made from adult skin cells, can give rise to any sort of human cell. Some scientists would like to insert such cells into nonhuman, animal embryos, in hopes of one day growing human organs for transplantation. Science Source hide caption

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Should Human Stem Cells Be Used To Make Partly Human Chimeras?

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Image of a mini-kidney formed in a dish from human induced pluripotent stem cells. Minoru Takasato/Nature hide caption

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Scientists Grow Primitive Human Kidneys In A Dish

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In 1954, Dr. Frederick C. Robbins, then chief of pediatrics and contagious diseases at Cleveland Metropolitan General Hospital, was one of three winners of that year's Nobel Prize in medicine. The scientists' work, which led to a vaccine against polio, was performed in human fetal cells. AP hide caption

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Research On Fetal Tissue Draws Renewed Political, Scientific Scrutiny

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Loki's Castle, the field of deep sea vents between Norway and Greenland, is home to sediments containing DNA from the newly discovered archaea. R.B. Pedersen/Centre for Geobiology, Bergen, Norway hide caption

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Missing Link Microbes May Help Explain How Single Cells Became Us

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Isabella Beukes, of Santa Rosa, Calif., has been legally blind for more than 40 years. An experimental treatment derived from embryonic stem cells seems to have enabled her now to see not just color but also some shapes. Tim Hussin for NPR hide caption

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Embryonic Stem Cells Restore Vision In Preliminary Human Test

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The heart beats in a mouse embryo grown with stem cells made from blood. Now the research that claimed a simple acid solution could be used to create those cells has been retracted. Courtesy of Haruko Obokata hide caption

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Easy Method For Making Stem Cells Was Too Good To Be True

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New research could be promising for infertile men. Scientists were able to make immature sperm cells from skin cells. Their next challenge is to make that sperm viable. iStockphoto hide caption

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'Provocative' Research Turns Skin Cells Into Sperm

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A cross-section of skeletal muscle in this light micrograph shows the individual, parallel muscle fibers (red). These fibers work in concert to power movement. Thomas Deerinck, NCMIR/ScienceSource hide caption

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Experimental Technique Coaxes Muscles Destroyed By War To Regrow

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This mouse egg (top) is being injected with genetic material from an adult cell to ultimately create an embryo — and, eventually, embryonic stem cells. The process has been difficult to do with human cells. James King-Holmes/Science Source hide caption

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First Embryonic Stem Cells Cloned From A Man's Skin

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Ryoji Noyori, a Nobel Prize-winning chemist and president of Japan's prestigious RIKEN research institute, bows at a news conference in Tokyo Tuesday to apologize for the scientific misconduct of a RIKEN colleague. Eugene Hoshiko/AP hide caption

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A mouse embryo grows from stem cells made by stressing blood cells with acid. The blood cells are tagged with a protein that creates green light. Courtesy of Haruko Obokata hide caption

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A Little Acid Turns Mouse Blood Into Brain, Heart And Stem Cells

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Maybe someday Jerry won't be laughing at George's follicularly challenged scalp. But despite scientific advances there's still no cure for baldness. NBC/NBC via Getty Images hide caption

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