Iron concentrations in PD in anti-IBA-1 reactive microglial cells were increased by about one quarter (26%, controls: 3.2 mM [2.2, 4.3] (n = 62); PD: 4.0 mM [2.8, 6.0] (n = 109)) but remained unaffected in anti GFAP reactive astroglial cells (controls: 4.3 mM [2.0, 6.9] (n = 88); PD: 4.1 mM [3.3, 5.4] (n = 142)). The gene discussed is GFAP; the disease is Parkinson disease.