ALIENS IN HUMAN DNA. “The host occasionally takes advantage of the presence of these ancestrally transmitted foreign genomes to serve physiological functions; several possible beneficial effects have been reported, including embryo implantation, gene variability, alternative splicing and polyadenylation, mother’s immunosuppression to protect the fetal allograft, protection against superinfection by exogenous retroviruses, and involvement in development and/or differentiation.”
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