(A) MDMs (n=4) were left untreated or pre-treated with 100μg/ml MDP for 48h, and then treated with 100μg/ml MDP for an additional 4h (acute). (B) MDMs (n=4) were left untreated (for acute) or pre-treated with 100μg/ml MDP for 24h, then transfected with scrambled, Twist1 or Twist2 siRNA alone or in combination, and 24h later (total 48h MDP pre-treatment) MDMs were treated with 100μg/ml MDP for an additional 4h (acute). (A-B) Recruitment of Twist1 and Twist2 to cytokine gene promoters was assessed by ChIP. Fold enrichment normalized to untreated, scrambled siRNA-transfected cells + SEM. (B) Statistical significance above the knockdown sample bars is compared to its corresponding scrambled siRNA sample. *, p<0.05; **, p<0.01; ***, p<0.001. Tx, treatment.