Figure 3. Staining of cytoskeleton fibers in 3T3 mouse fibroblast cells with
QD-streptavidin. (A) Microtubules were labeled with monoclonal anti-α-
tubulin antibody, biotinylated anti-mouse IgG and QD 630–streptavidin
(red). (B) Control for (A) without primary antibody. (C) Actin filaments were
stained with biotinylated phalloidin and QD 535–streptavidin (green).
(D) Control for (C) without biotin-phalloidin. The nuclei were
counterstained with Hoechst 33342 blue dye. Filter sets ex 480 20
nm/em 535 10 nm and ex 560 27.5 nm/em 635 10 nm were used to
observe signals of QD 535 and QD 630, respectively. Scale bar, 10 for
(A), 24 for (B) through (D).