Mesenchymal stem cell derived exosomes mitigate COVID-19 cytokine storm via Annexin A1 and TGF-β mediated MAPK pathway inhibition. - Ebrahim N; Al Saihati HA; Dessouky AA; Ismail YM; Shamaa AA; Mohamed SA; Mohamed ME; Nosseir N; Eladl MA; Di Leva G; Badr OA (Stem cell research & therapy, 2026)