Although microglia were reported to be involved in AD (Solito and Sastre, 2012) and PD (Le et al., 2016), we only observed a significant increase in one (CD40) out of four microglial markers tested in AD (Figure 1A) and in two (CD40 and ITGAM) in PD samples (Figure 4A). Here, CD40 is linked to Alzheimer disease.