Excised peritoneal membranes were immediately frozen in liquid nitrogen and stored at −80°C until use. Tissues were diced and ground to a fine powder with intermittent addition of liquid nitrogen. Omni–assay for transposase-accessible chromatin with high-throughput sequencing (ATAC-seq) was performed as described (41 (link)). Briefly, 100,000 nuclei per sample were isolated using an iodixanol gradient, and ATAC-seq was performed according to the original protocol (42 (link)) using a Nextera DNA sample preparation kit (Illumina, FC-121-1030). After amplification, library DNA was isolated (Qiagen MinElute kit), size selected, and sequenced (Illumina HiSeq 4000).
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