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Time course of PGD2 content in the brain after tail clipping. Tail clip induced production of PGD2 in B7 and B20 TG mice but not in wild-type mice. Time point “0 h” represents the control data, immediately after tail clip. n = 6 for each genotype at each time point; *, P < 0.01; **, P < 0.001 by unpaired Student's t test.
