*4.7. PGE2 Determination*

PGE2 levels were measured in the RAW 264.7 cell media using an ELISA kit (Cayman Chemical, MI, USA) according to the manufacturer's specifications, and expressed as pg/mL. Celecoxib (Sigma-Aldrich, Milan, Italy) 3 μM (1.14 μg/mL), was used as a positive control.
