UPP2 and neoplasm: Last, focusing on the tumours that could not readily be assigned to the aforementioned subtypes, we identified a fraction of nodules that revealed enrichment of hepcidin antimicrobial peptide (Hamp), Hamp2 and uridine phosphorylase 2 (Upp2) expression (Hamp2+Upp2+; Fig. 5a and Supplementary Fig. 10).