In human brain following subarachnoid hemorrhage excised cortex had upregulated mRNA expression of Sox2 and Musashi2 as evaluated by PCR, in tandem with other markers of proliferation; this was matched by immunohistochemical detection of Musashi2 in tandem with the proliferation marker Ki67 (Sgubin et al. 2007) . This evidence concerns the gene MSI2 and subarachnoid hemorrhage.