deparaffinization using Histoclear (2 x 10 min) and a gradient of ethanol (EtOH)
concentrations, each for 5 minutes in the following order: 2 x 100%, 1 x 95%, 1
x 70% and 1 x 50%, before being washed in Tris-buffered saline (TBS) for 3 x 5
minute washes. Slides were then placed in Vector Unmasking Solution under high
heat and pressure for 20 minutes before a final TBS wash. Slides were
permeabilized and blocked for 1 hour (5% horse serum and 0.3% Triton-X-100 in
PBS) before incubation with primary antibodies overnight at 4°C in a
humid chamber. Microglia/macrophages were detected with rat anti-CD68 (Abcam,
Ab53444, 1: 100) and cell death was assessed using rabbit anti-RIPK3 (Novus
Biologicals, NBP1-77299, 1:100) and rat anti-MLKL (Merck-Millipore, MABC604,
1:100). Following washes in PBS, fluorescently conjugated secondary antibodies
were applied (Invitrogen, 1:1000). Slides were counterstained with Hoechst and
coverslipped with Fluoromount-G (Southern Biotech). Images were acquired with an
Olympus spinning disk confocal microscope using a 60X objective with Slidebook 6
software. 3 animals were analyzed per time point.