8-oxo-dG	8-oxo-2′-deoxyguanosine
ACAN-/-	deletion of aggrecan in homozygous mouse
ACC	anterior cingulate cortex
AD	Alzheimer’s disease
ALS	amyotrophic lateral sclerosis
AP-1	activator protein 1
ASD	autism spectrum disorder
BBB	blood–brain barrier
BCAN-/-	deletion of brevican in homozygous mouse
BDNF	brain-derived neurotrophic factor
Bral2/HAPLN-4	brain link protein
C4S	chondroitin 4 sulfate
C6S	chondroitin 6 sulfate
CNS	central nervous system
Crtl-1/HAPLN-1	cartilage link protein
CSF	cerebrospinal fluid
CSPGs	chondroitin sulfate proteoglycans
CSs	chondroitin sulfates
CTTNBP2	cortactin binding protein 2
DNTfR1	dominant negative nonfunctional transferrin receptor-1
EAE	experimental autoimmune encephalomyelitis
ECM	extracellular matrix
FMRP	fragile X mental retardation protein
FXS	fragile-X-syndrome
GAG	glycosaminoglycan
GSH	glutathione
GSSG	glutathione disulfide
HA	hyaluronic acid
HAPLN1-/-	deletion of cartilage link protein in homozygous mouse
HAS	hyaluronan synthase
KO	knockout
LTP	long-term potentiation
MMP	matrix metalloproteinase
MT	metallothionein
NMDA	N-methyl-D-aspartate
Otx2	orthodenticle homeobox 2
PBS	phosphate buffer solution
PD	Parkinson’s disease
PD	postnatal day
PGs	proteoglycan proteins
PNNs	perineuronal nets
PTR	proteoglycan tandem repeat
PV	parvalbumin
RNS	reactive nitrogen species
ROS	reactive oxygen species
SOD	superoxide dismutase
TfR1	normally-functioning transferrin receptor-1
TGN	trans-Golgi network
TIMP	tissue inhibitor of MMPs
TN-R	tenascin-R
tPA	tissue plasminogen activator
RS-XRF	rapid scanning x-ray fluorescence spectroscopic imaging
WFA	Wisteria floribunda agglutinin
XFM	X-ray fluorescence microscopy