XPNPEP1 and Alzheimer disease: Among them, 8 proteins (Nos2, Oxr1, Pck2, Grb10, Cat, Nqo1, Comt, and Rps11) were only identified in PLum-AI cells (and not in PLum-AD cells) while 12 proteins (Hnrnpul2, Xpnpep1, Hmgcs1, Oasl1, Ifit1, Acat2, Fdps, Epcam, Casp3, Tpd52, Ap1s1, and Atp6v1g1) were exclusively identified in PLum-AD cells (and not in PLum-AI cells).