Immunofluorescence was performed as recently described29 (link). Cells were fixed with 3% formaldehyde/PBS for 30 min, permeabilized with 0.5% Triton X-100/PBS for 10 min and blocked with 3% BSA/PBS for 1 h. Staining of cleaved caspase 3 (Cell Signaling, #9664) was carried out overnight at 4 °C and with anti-rabbit secondary antibody for 2 h at room temperature. After several washes with PBS, samples were covered with Vectashield/DAPI mounting medium (Vector Labs). Images were acquired using an AxioImager.Z1/ApoTome microscope (Zeiss).
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