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The expression of S1P receptor 1‐5 mRNA using RT‐PCR in NRK‐49F cells and UUO. In vitro and in vivo showed mRNA expressions of S1PR1, 2, 3, and 5, but not S1PR4. UUO, unilateral ureteral obstruction; S1P, sphingosine‐1‐phosphate; NRK‐49F, normal rat kidney interstitial fibroblast.
