Sections were de-paraffinized three times (5 min) in xylene followed by dehydration in graded ethanol and finally rehydrated in running tap water. For antigen retrieval, sections were boiled in 10 mM citrate buffer (pH 6.0) for 10–15 min. Sections were incubated with hydrogen
peroxide for 15 min to minimize non-specific staining and then rinsed three times (5 min each) with 1 PBST (0.05% Tween-20).