ABCG2 and hyperinsulinemic hypoglycemia, familial, 4: Six putative transmembrane transporters were upregulated in the iron deficiency + Hb condition; (i) three P-glycoprotein-5 transporters (PgP5, EHI_175450, EHI_125030, EHI_075410) and (ii) three ABC transporters (EHI_095820, EHI_178050, EHI_178580).