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Fluorescent in situ hybridization (FISH) performed on PB‐MSCs engraftments at 4, 8, and 12 weeks after surgery. No intranuclear positive signal was found in the Blank group and Sham group. A small number of intranuclear signals was positive at each time point in MSCs group, PEG‐CHI group, and PEG‐CHI‐KGN group (Blue: DAPI, Green: FISH).
