CD68 and Alzheimer disease: Furthermore, the larger microglia seen in the AD retina were restricted to the CD68 + population, and were larger than CD68- microglia (in AD) as well as the CD68 + microglia (in controls) (Fig. 6E; CD68 + control: 1141.293 ± 71.504 μm3 (mean ± SEM); CD68- control: 640.486 ± 60.079 μm3 (mean ± SEM); CD68 + AD: 1860.064 ± 96.137 μm3 (mean ± SEM); CD68- AD: 622.622 ± 83.165 μm3 (mean ± SEM); p-values found in Fig. 6E (right)).