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  • Title: The human endogenous retrovirus ERV-3 is upregulated in differentiating placental trophoblast cells.
    Author: Boyd MT, Bax CM, Bax BE, Bloxam DL, Weiss RA.
    Journal: Virology; 1993 Oct; 196(2):905-9. PubMed ID: 8372456.
    Abstract:
    The single copy endogenous retrovirus locus ERV-3 is known to be primarily expressed in the placenta. The absence of expression of this gene in choriocarcinoma cell lines has led to speculation that this may be a defect associated with this abnormality. We show here that ERV-3 is not normally expressed in the cytotrophoblast from which these tumour cells are derived but is expressed in normal syncytiotrophoblast. The conservation of the ERV-3 open reading frame for env in ape and old world monkey species and its tight regulation and site of expression suggest a functional role for this gene in this tissue.
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