At the 8th week after 2VO surgery or brain injection, the rats were anesthetized and killed by cervical dislocation. The brains were removed and immediately processed using the FD Rapid GolgiStain Kit (FD Neurotechnologies, Columbia, SC, USA) according to the manufacturer’s protocol. Finally, brain slices were observed by brightfield microscopy using a × 20 objective on a Zeiss Axio Scope A1 microscope. An average of 15–30 neurons were randomly examined in each group from 3 brain slices by an investigator blind to the treatment of the rat. The selected neurons were traced and reconstructed using Image-Pro Plus software, and the dendritic complexity was determined by Sholl analysis.
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