Serum exosomes from young rats improve the reduced osteogenic differentiation of BMSCs in aged rats with osteoporosis after fatigue loading in vivo. - Jingqiong Xun; Chan Li; Meilu Liu; Yueming Mei; Qiongfei Zhou; Bo Wu; Fen Xie; Yuling Liu; Ruchun Dai (Stem Cell Research & Therapy, 2021)