Scientific DataA Million-Scale, Difficulty-Stratified Optical-Microscopy Image Annotation for Neuron ReconstructionMingwei LiaoWu ChenShengda BaoXueyan JiaXiaowei ChenChi XiaoQingming LuoHui GongAnan Li2026-06-22Full textDOI https://doi.org/10.1038/s41597-026-07668-4