This initial LIBRA-seq application involved probing the B cell repertoire of donor N90, an individual with chronic HIV-1 infection, against a panel of antigens including 5 HIV-1 Env antigens (KNH1144, BG505, ZM197, ZM106.9, and B41) and 4 influenza HA antigens (H1 NC99, H1 Michigan, H5 Indonesia, and H7 Anhui) [9,25]. This evidence concerns the gene ERVW-1 and influenza.