text:  Cox2 KO BMMs in vitro MCSF+RANKL+PGE2 3days 20 BMMs from bone marrow genotype/variation: Cox2 KO; treatment: with MCSF+RANKL+PGE2 for 3 days; gender: Male; strain: CD1; age: 2 month old; experiment: 2; tissue: Marrow from femurs and tibiae used to isolate BMMs