div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader040vdocumentssitereader040viewer2022020523575068821a28ab0f07b07b3ehtml5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: HIV requires multiple gp120 molecules for CD4-mediated infection src=https:reader040vdocumentssitereader040viewer2022020523575068821a28ab0f07b07b3ehtml5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© 1990 Nature Publishing Grouppdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader040vdocumentssitereader040viewer2022020523575068821a28ab0f07b07b3ehtml5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: HIV requires multiple gp120 molecules for CD4-mediated infection src=https:reader040vdocumentssitereader040viewer2022020523575068821a28ab0f07b07b3ehtml5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© 1990 Nature Publishing Grouppdivdiv class=ts-pagebuttonPage 3button div class=ts-image a href=https:reader040vdocumentssitereader040viewer2022020523575068821a28ab0f07b07b3ehtml5page3jpg target=_blank amp-img class=ts-thumb alt=Page 3: HIV requires multiple gp120 molecules for CD4-mediated infection src=https:reader040vdocumentssitereader040viewer2022020523575068821a28ab0f07b07b3ehtml5thumbnails3jpg width=142 height=106 layout=responsive amp-imga divp© 1990 Nature Publishing Grouppdiv