Figure 1From: Two types of nanoparticle-based bio-barcode amplification assays to detect HIV-1 p24 antigenSchematic illustrations of two biobarcode amplification (BCA) assays and ELISA assay to detect HIV-1 p24 antigen. (A) ELISA, (B) Microplate [22] and (C) MMPs methods. The detailed description of the methods is described in Materials and Methods. The enzyme (E) used in the ELISA assay was horse radish peroxidase.Back to article page