HGF and Stroke: Moreover, immunofluorescence analysis showed that after intravenous injection into C57BL/6 mice at 72 h postischemic stroke, the red fluorescent DiD‐EXO‐PD‐L1‐HGF was co‐localized with glial fibrillary acidic protein (GFAP)‐ or MAP2‐expressing (green fluorescence) cells in the brain with stroke (Figure S10, Supporting Information).