The number of heme oxygenase-1 positive Kolmer cells was significantly increased in the choroid plexus of animals 1 (n = 166.3 ± 40/mm2; p < 0.05) and 3 days (n = 203.1 ± 18.5/mm2; p < 0.01) following subarachnoid hemorrhage induction when compared to naïve animals (n = 64 ± 25.2/mm2). The gene discussed is HMOX1; the disease is subarachnoid hemorrhage.