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concepts
Nature 419, 437 (3 October 2002) | doi:10.1038/419437a
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Stem-cell fusion: A twist of fate
Helen M. Blau1
It has long been known that sperm and eggs fuse together selectively, and not randomly with any other cell type. Some viruses, which are among the most primitive of organisms, express fusion proteins that allow them to penetrate mammalian cells.
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