Other key AD-related genes expressed in fetalMG and co-pMG (and bloodMono) included APP, PICALM, and CD33; PD-related genes included PARK15, PINK1, SNCA, and DJ-1; and MND-related genes included C9orf72, TDP43, and SOD1. Note that almost all of these genes were also expressed in pMacpre, pMac, and pMGL. Here, CD33 is linked to Parkinson disease.