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Hematoxylin and eosin (H&E) staining of brain tissues. (A) Cortex. (B) Hippocampus (arrows indicate hippocampal CA2 region). (a) Normal group (n=6). (b) Non-PQQ TBI group (n=6). (c) TBI+PQQ 5 mg/kg per day group. (d) TBI+PQQ 7 mg/kg per day group. (e) TBI+PQQ 10 mg/kg per day group (n=6); scale bars=100 μm; PQQ, pyrroloquinoline quinine; TBI, traumatic brain injury).
