{
    "title": "Effect of mutations in the second extracellular loop of CXCR4 on its utilization by human and feline immunodeficiency viruses.",
    "journal": "Journal of virology",
    "date": "1999",
    "authors": "Brelot A, Heveker N, Adema K, Hosie MJ, Willett B, Alizon M",
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