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DihydroS1P (A), S1P (B), dihydrosphingosine (C), sphingosine (D), ceramide (E), and sphingomyelin (F) levels were determined in nonpregnant whole uteri (wild type and Sphk1–/–Sphk2+/–) and day 7.5 pc decidua (wild type, Sphk1–/–Sphk2+/+, Sphk1+/+Sphk2–/–, and Sphk1–/–Sphk2+/–) by mass spectrometry. Data represent mean values ± SE. n = 3. *P < 0.05; **P < 0.01, paired Student’s t test.
