ATF5 and neoplasm: Other than the absence of tumors and the presence of glial scarring in areas of prior tumor localization, H&E staining of the brains of the C57BL/6 mice sacrificed 6-13 months after Pen-d/n-ATF5-RP treatment indicated no evident abnormalities and both the subventricular and hippocampal subgranular zones appeared normal (Supplementary Figure 2).