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. 2007 Mar 14;1(1):014107. doi: 10.1063/1.2714185

Figure 3.

Figure 3

Optical micrographs of droplets in a GOAgg assay. 1.0 μg∕mL antigen concentration shows the least amount of gold nanoparticles collection on top for 30 min incubation time. The white areas in the top of the droplets are the dense latex particle phases. The gold nanoparticles reaching the top are easily observed because of their intensively red color.