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(Graphical abstract) Exosomes secreted from BMMSCs carrying miR‐126 promoted the angiogenesis of HUVECs by down‐regulating PIK3R2 to activate the PI3K/Akt signalling pathway. BMMSCs, bone marrow mesenchymal stem cells; HUVECs, human umbilical vein endothelial cells; PIK3R2, phosphoinositol‐3 kinase regulatory subunit 2
