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EM images of HIV-1 MN samples. (A) HIV-1 MN alone incubated with PAG (negative control). (B) HIV-1 MN liganded with soluble CD4 and then incubated with PAG (negative control). (C) HIV-1 MN treated with irrelevant MAb 2909 and incubated with PAG (negative control). (D) HIV-1 MN treated with MAb 2G12 (anti-gp120) and labeled with PAG (positive control). Scale bar, 100 nm.
