TERT and osteogenesis imperfecta: We investigated the impact of EVs on cell proliferation, telomerase activity, telomerase reverse transcriptase (TERT) expression, cell cycle, and extracellular signal-regulated protein kinase 1/2 (ERK1/2) levels in human CPCs and in our established osteogenesis imperfecta (OI)-specific SHED (OI-SHED).