FOXO3 and stroke disorder: EXO‐PD‐L1‐HGF facilitates endogenous nestin+ neural progenitor cell (NPC)‐induced neurogenesis via STAT3‐FOXO3 signaling cascade, which plays a pivotal role in cell survival and neuroprotection, thereby mitigating infarct size and enhancing neurological recovery in a murine stroke model.