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. 2015 Jun 18;10(6):e0128562. doi: 10.1371/journal.pone.0128562

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Fig 4 — Indirect ELISA of the indicated gp41 immunogens using a monoclonal antibody specific for the six-helix bundle (NC-1)[76]. Positive control is a recombinant six-helix bundle (N34C28). Negative controls are an N-HR peptide (N36), a C-HR peptide (C34) and an irrelevant coiled-coil trimer (A27) which was expressed and purified in a manner similar to the gp41 immunogens [93].