<i>env</i> Chimeric Virus Technology for Evaluating Human Immunodeficiency Virus Susceptibility to Entry Inhibitors

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."