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Sphingosine 1-phosphate receptor expression in the central nervous system: Schematic illustrating the expression of Sphingosine 1-phosphate (S1P) receptor subtypes 1–5 (referred to as S1P1–5) in the cells of the central nervous system. Note that S1P receptors are expressed by endothelial cells as well. References: [31,32,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55]. The copyright license of this illustration is with the authors.
