Volume 46, no. 12, p. 3954-3962. Page 3955: Position numbering throughout corresponds to HIV-1 (LAV-1) recombinant clone pNL4.3 (GenBank accession no. M19921).
Page 3958, column 2, lines 3 and 4: “the same sequences in the respective HIV-1 NL4.3 strains selected in vitro were observed” should read “the same env sequences were observed as those in the respective in vitro-selected HIV-1 NL4.3 strains.”
Page 3961, column 1, lines 29 and 30: “selection of CCR5-using strains” should read “selection toward CCR5-using strains.”