Figure 1. Detection of cancer marker Her2 with QD-IgG. (A, C) Fixed
breast cancer SK-BR-3 cells were incubated with monoclonal anti-Her2
antibody and goat anti-mouse IgG conjugated to QDs. Her2 was clearly
labeled with (A) QD 535–IgG and (C) QD 630–IgG (B, D). When cells
were incubated with normal mouse IgG and QD-IgG, there were no
detectable or very weak nonspecific signals on the cell surface. The nuclei
were counterstained with Hoechst 33342 (blue). Filter sets ex 480 +-20
nm/em 535 +-10 nm and ex 560+-27.5 nm/em 635+-10 nm were used for
QD 535 and QD 630, respectively. Scale bar, 10