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CD9 has been shown to be essential for sperm/oocyte fusion in mice, the only non-redundant role found for a member of the tetraspanin family. CD9 can act in cis, reconstituting sperm/oocyte fusion when ectopically expressed in oocytes from CD9 null mice, or in trans, inhibiting sperm fusion when the large extracellular domain (LED) is added to CD9-positive oocytes as a soluble protein. In contrast...
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