The following were obtained from the respective suppliers: Dulbecco’s modified Eagle medium containing 25 mM HEPES, penicillin G potassium salt, streptomycin sulfate, dexamethasone, fatty acid-free bovine serum albumin, and recombinant human insulin (Sigma-Aldrich Corp., St. Louis, MO, USA); L-ascorbic acid phosphate magnesium salt n-hydrate, 3-isobutyl-1-methylxanthine (IBMX), and Triglyceride E-Test Kits (Wako Pure Chemical Industries Ltd., Osaka, Japan); fetal bovine serum (FBS) (MP Biomedicals, Solon, OH, USA); PGD2, 11d-11m-PGD2, MRE-269, BW245C, and 15R-15-methyl-PGD2 (15R-15m-PGD2) (Cayman Chemical (Ann Arbor, MI, USA); M-MLV reverse transcriptase (Ribonuclease H minus, point mutant) and polymerase chain reaction (PCR) Master Mix (Promega Corp., Madison, WI, USA).
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