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playing a crucial role in the differentiation of multicellular tissues and organs and even in sexual reproduction, in the fusion of egg cells and sperm.Such fused cells are also involved in metazoan membranes such as those that prevent chemicals from crossing the placenta and the brain body separation. Two viral components have been identified. The first is syncytin, which came from a virus.The second identified in 2002 is called EFF-1, which helps

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