FOXO3 and Stroke: To verify the neuroregenerative ability of EXO‐PD‐L1‐HGF through the activation of the FOXO3 pathway in mice with stroke, we performed infarct volume measurements by means of triphenyltetrazolium chloride (TTC) staining and neurological functional assessments of control, EXO (with FOXO3‐NL or FOXO3–/–)‐treated, and EXO‐PD‐L1‐HGF (with FOXO3‐NL or FOXO3–/–)‐treated ischemic stroke models.