According to Quan et al. 2020, to induce M1 and M2 RAW 264.7 cell phenotypes, 50 ng/mL lipopolysaccharide (LPS) (E. coli, serotype 055:B5) and 40 ng/mL IL-4 were added to the culture, respectively, after stabilizing the cells for 1 h. Would the protocol be with only 1 exposure? Is there the use of FBS in the culture medium?
Thanks!