available examples of the humoral immune response to HIV are providing important
information for the development of therapies and prophylaxis for HIV-1 infection. Here, we
report a CD4-binding site (CD4bs) antibody, named N6, that potently neutralized 98% of HIV-
1 isolates, including 16 of 20 that were resistant to other members of its class. N6 evolved a
mode of recognition such that its binding was not impacted by the loss of individual contacts …