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Adenosine and ATPγS enhance the EC barrier in HLMVEC. HLMVECs were treated with increasing concentrations (10–200 μM) of adenosine (a) or ATPγS (b) and TER was recorded. Results are presented as mean ± SEM of three independent experiments. Arrows indicate the time points of Ado and ATPγS administration. Ado: adenosine; ATPγS: adenosine 5′-[γ-thio]-triphosphate; EC: endothelial cell; HLMVEC: human lung microvascular endothelial cell; TER: transendothelial electrical resistance
