On day 1 post-stroke intracellular MPO was significantly reduced in stroke patients’ granulocytes compared to controls (MPO–MFId1(mean ± SD): 4598 ± 1642 vs. MPO–MFIControl: 6580 ± 1955; p = 0.0136) (Fig. 1a). The gene discussed is MPO; the disease is Stroke.