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This new genetic approach is also able to differentiate between some hair colours that are similar, for example, between red and reddish blonde, or between blonde and dark blonde hair.
BBC: Hair colour predicted from genes
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The genetic approach to reprogramming, pioneered by Shinya Yamanaka who won the 2012 Nobel Prize in medicine for his work, allows human cells to be transformed back into an embryonic-like, pluripotent state.
FORBES: Scientist Shows How Small Molecules Generate Better Stem Cells
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But groups representing families affected by genetic disorders said the approach should not be ruled out altogether.
BBC: Scientists oppose human gene modification
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An important current approach, known as genetic profiling, involves comparing crime scene DNA with that from a suspect or with a profile stored in a database.
BBC: Forensic test can predict hair and eye colour from DNA
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The potential applications for medical science are impressive enough, but consider this additional benefit: since the droplets contain no genetic material, scientists can completely sidestep all the ethical red tape surrounding the alternative stem cell approach to artificial tissue.
ENGADGET: Oxford University researchers create new 3D printed 'soft material' that could replace human tissue