(A) Internalization of apoptotic or necrotic GFP-expressing RAW264.7 cells. (B) Phagocytosis of fluorescent negatively charged carboxylated and positively charged amino microspheres (B) in primary M2 (IL-4) and M0 macrophages. Cytochalasin D (Cyto) (6 µM) was used as an inhibitor of phagocytosis, 1 h before phagocytosis. Data are shown as means of relative fluorescence units (RFU) ± standard error of the mean (SEM). 