In contrast, positive KCa3.1 immunoreactivity was observed in murine and human tissues such as endothelial cells (of human meningeal artery in the present study) and glioblastoma multiforme (Figure 1D), which were previously shown to express KCa3.1 [7], [8], [39], [40]. The gene discussed is KCNN4; the disease is glioblastoma.