Let-7a-5p derived from parathyroid hormone (1–34)-preconditioned BMSCs exosomes delays the progression of osteoarthritis by promoting chondrocyte proliferation and migration. - Shao, Litao; Ding, Lu; Li, Weizhao; Zhang, Chi; Xia, Yu; Zeng, Miaoyu; Ye, Zhizhong; Deng, David Y. B. (Stem Cell Research & Therapy, 2025)