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This research located that protein, Tsg101, and shows that without it the virus cannot reproduce and leave the cell.
FORBES: Myriad Genetics On HIV Drug Trail
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He said the hope was that one day the technology could replace current dental implants, which cannot reproduce a natural root structure.
BBC: Researchers grow teeth from gum cells
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The feeder cells cannot reproduce because they have been irradiated, but they provide the stem cells with the nutrients and proteins they need to divide and reproduce indefinitely.
FORBES: Aberrations Pose A Challenge for Reprogramming Stem Cells
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And although business plans cannot reproduce, successful ones do command a growing share of the economy's resources, as companies expand on the back of them and rivals copy them.
ECONOMIST: Evolutionary economics is surviving, but not thriving
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Less successful are some of the other ballerinas, who cannot quite reproduce the crispness of the Balanchine style - with its long leg extensions and slow turns - despite the presence of Mr Balanchine's anointed successor, Patricia Neary, in supervising the production.
BBC: Sparkling Stravinsky