FTH1 and Parkinson disease: Here, we observed a significant enrichment of one of the genes that encode for the major iron storage protein ferritin, the ferritin heavy chain 1 (FTH1), in pooled epithelial IBD biopsies (Fig. 2A); and in pooled epithelial PD biopsies depletion of FTH1 and the gene that encodes for ferroportin (SLC40A1), the protein that drives ferritin export (Fig. 2B), relative to NHC biopsies.