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Sphingosine‐1‐phosphate (S1P) is a bioactive lysosphingolipid that is found in relatively high concentration in human plasma. Erythrocytes, endothelial cells, and activated platelets are the main sources of circulating S1P. The majority of plasma S1P is transported bound to high‐density lipoprotein (HDL) and albumin. In recent years, HDL‐bound S1P attracted much attention due to its cardioprotective...