Fig. 10. Immunofluorescence microscopy of MCF-7 cells during staurosporine-induced apoptosis. Cells grown on the coverslips were untreated (A-E) or treated (F-O) with 2 µM staurosporine for 12 hours, fixed and double-stained with NuMA (A and F) and lamin B (B and G) or NuMA (K) and p85 fragment of PARP-1 (L) primary antibodies and FITC-conjugated rabbit-anti-mouse (A and F) and TRITC-conjugated rabbit-anti-goat (B and G) or FITC-conjugated goat-anti-mouse (K) and TRITC-conjugated goat-anti-rabbit (L) secondary antibodies. Samples were counterstained for DNA with Hoechst (D, I and N). Note the partially condensed distribution of NuMA and wrinkled distribution of lamin B in shrunken apoptotic cells. Hoechst stain shows that DNA is partially condensed. These cells are p85 fragment of PARP-1 positive (arrows). Bar, 10 µm.