library_construction_protocol: Brain tissues were crosslinked by 1% formaldehyde (ThermoFisher scientific) and sonicated in RIPA buffer (10 mM Tris-HCl, 1 mM EDTA, 0.5% sodium deoxycholate, 0.1% SDS, 1% NP-40, 1× Protease inhibitor cocktail (Roche), pH 8.0) to 200-500 bp. The sonicated lysate was subjected to immunoprecipitation with specific antibody. The immunoprecipitated DNA (at least 1ng) was purified and subjected to libraries generation. ChIP-seq libraries were generated using NEBNext® Ultra™ II DNA Library Prep Kit (New England Biolabs) according to the manufacturer's instructions.