EdU at a concentration of 3 μg/mL was added to the tissue slice culture medium 2 h before fixation. Simultaneous TUNEL and EdU staining was performed as described previously [35 (link)]. Briefly, tissue sections were deparaffinized in xylene followed by rehydration in graded alcohols and then blocked with PBS 3% bovine serum albumin (BSA). TUNEL reaction was performed using an In Situ Cell Death Detection Kit (Roche Life Sciences, Penzberg, Germany), after which the sections were incubated with Click-iT Alexa Fluor 594 (Invitrogen, Carlsbad, CA, USA) cocktail buffer for 30 min.
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