PTPRN2 and pancreatic serous cystadenoma: The body of protein tyrosine phosphatase, receptor type N2 (PTPRN2), which contains a SNP previously associated with PsA in GWAS [36], was 17% hypomethylated in PsA probands, while the promoter and body of HCG26 was also significantly hypomethylated by 31% in PsA vs. PsC probands.