AD	Alzheimer’s disease
ApoE	Apolipoprotein E
Aβ	β-amyloid
BBB	Brain–blood barrier
BCSFB BMP	Blood–CSF barrier Bone Morphogenetic Protein
CNS	Central nervous system
CP	Choroid plexus
CPe	Choroid plexus epithelium
CSF	Cerebrospinal fluid
eCSF	Embryonic cerebrospinal fluid
HSPGs	Heparane sulfate proteoglycans
JCPyV	Human polyomavirus
LRP1 LV CP	Lipoprotein receptor-related protein 1 Lateral ventricle choroid plexus
miR	MicroRNA
NSCs	Adult neural stem cells
qNCS OTX2	Quiescent adult neural stem cells Homeobox protein OTX2
SARS-CoV-2	SARS-coronavirus 2
SGZ	Subgranular zone
SVZ	Subventricular zone
TTR	Transthyretin
VCAM1 4V CP	Vascular cell adhesion molecule-1 4th ventricle choroid plexus