B. M-CSF induced mouse bone marrow derived macrophages (BMMs) were stimulated with 20 ng/mL mouse recombinant IL-4 (B) in the absence or presence of PGE2 ± varying concentrations of TP-16 for 12 hr. The mRNA levels of selected M2 markers (Arg-1 and Ym-1) were measured by q-PCR. Data are normalized to β-actin expression levels (n=3). 