Immunofluorescence analysis of proBDNF expression in human SHSY-5Y cells. Fixed (4% formaldehyde), permeabilized, and blocked (10% normal horse serum, 0.1% Triton X100) SHSY-5Y cells were incubated with proBDNF antibody R-087-100 (1:1000, green) for 1 hour. Primary antibody binding was visualized with a secondary donkey anti-rabbit-CF488A antibody (4 µg/mL, 1 hour incubation). Cell nuclei were stained with Hoechst dye (blue). BDNF-IR is observed in the perinuclear cytoplasm. Magnification: 100x.