Phagocytic activity and TNF-α release of wt and cx3cl1−/− microglia. Phagocytic activity of wt and cx3cl1−/− microglia exposed to OGD-CM. a, Results expressed as the percentage of phagocyting cells. b, Results expressed as the number of phagocyted microspheres per cell as detailed in Materials and Methods. Data are the mean ± SE, n = 6–7 (total number of cells counted for each condition: 1350 for wt; 900 for cx3cl1−/−). Student's t test: **p < 0.01. c, TNF-α released in culture medium of microglia, expressed as picograms per milliliter per milligram of total cell proteins. Data are the mean ± SE, n = 6–14. Student's t test: *p < 0.05.