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Immunohistochemical staining of 3-mercapto-sulfurtransferase (3-MST) (a,f,k), cystathionine-γ-lyase (CSE) (b,g,l), ethylmalonic encephalopathy 1 protein (ETHE1) (c,h,m), sulfide:quinone oxidoreductase (SQOR) (d,i,n) and thiosulfate sulfurtransferase (TST) (e,j,o) in the ascending colon of an pediatric Crohn’s disease (CD) patient (case number: 21480; a–e), ulcerative colitis (UC) patient (case number: 17921; f–j) and a healthy control (case number: 41952; k–o). Scale bar: 50 μm.
