CXCL8 and atrial fibrillation: Those factors not detected in the BMSC-CM when compared to SS-AF-MSC-CM and/or hDF-CM included both the inflammatory group (endoglin, IL-8, TGF-β1, MCP-1, MIP-1α, GM-CSF, IL-1β) and molecules in other categories (ADAMTS-1, angiopoietin-2, angiostatin, DDPIV, EGF, EG-VEGF, endostatin, HGF, IL-1β, MMP-8, MMP-9, PD-ECGF, PDGF-AB/BB, thrombospondin-2 and VEGF-C; Table S1).