Figure 4. Detection of nuclear antigens and double labeling. (A) Nuclear
antigens in the nuclei of human epithelial cells were labeled with ANA, anti-
human IgG–biotin and QD 630–streptavidin. (B) When normal human IgGs
were used in place of ANA, no detectable stain was observed. (C) The
nucleus of a 3T3 cell was stained with ANA, anti-human IgG–biotin, and QD
630–streptavidin (red). The microtubules were labeled with mouse anti-α-
tubulin antibody, anti-mouse IgG–biotin, and QD 535–streptavidin (green).
(D) Her2 on the surface of SK-BR-3 cells was stained green with mouse
anti-Her2 antibody and QD 535–IgG (green). Nuclear antigens were labeled
with ANA, anti-human IgG–biotin and QD 630–streptavidin (red). Filter sets
ex 480 20 nm/em 535 10 nm and ex 560 27.5 nm /em 635 10 nm
were used for detecting QD 535 and QD 630 and capturing images; ex
460SP/em 500LP was also used for observation. Scale bar, 50 for (A),
(B), and (D), and 10 for (C).