FTH1 and Parkinson disease: Our findings revealed disease-specific differences in transcript accumulation for FTH1, the ferritin heavy chain gene critical for primary iron storage, within several immune cell types (Fig. 2E); specifically, we detected significantly increased transcript accumulation of FTH1 in epithelial cells of IBD patients and significantly decreased in epithelial cells of PD patients compared to NHC (Fig. 2A & B).