SOX2 and subarachnoid hemorrhage: Also, (Sgubin et al. 2007) showed up-regulation of expression a variety of stem/progenitor cell markers, including Sox2 and Musashi2, in brain tissue from 4 human patients with subarachnoid hemorrhages from ruptured aneurysms, and, using immunostains, demonstrated a correlation between Musashi2-immunopositive cells and Ki67-immunopositive cells.