Phagocytosis of apoptotic neutrophils polarized macrophages toward a reparative phenotype (Ly6ClowMerTKhigh) 3 days after myocardial infarction (267), which was mediated by neutrophil gelatinase-associated lipocalin (NGAL) (263) and S100A9 (268). Here, S100A9 is linked to myocardial infarction.