25(OH)D	25-hydroxyvitamin D
4HDHC	4β-hydroxy-7-dehydrocholesterol
4-OH-DHC	4α- and 4β-hydroxy-7-DHC
5-HT1A	Serotonin 1A receptors
7-DHC	7-dehydrocholesterol
7-DHCR	7-dehydrocholesterol reductase
7-kChol	7-ketocholesterol
7-kDHC	7-keto-cholesta-5,8-dien-3β-ol
7-PT	7-dehydropregnanetriol
8-DHC	8-dehydrocholesterol
8-PT	8-dehydropregnanetriol
ASCVD	Atherosclerotic cardiovascular disease
ASD	Autism spectrum disorder
C/EBP	CCAAT/enhancer binding protein
CNS	Central nervous system
CRALBP	Cellular retinaldehyde-binding protein
CSF	Cerebrospinal fluid
CYP27	Sterol 27-hydroxylase
DEGs	Differentially expressed genes
DHCDO	3β,5α-dihydroxycholesta-7,9(11)-dien-6-one
DHCEO	3β,5α-dihydroxycholest-7-en-6-one
DHCR7	7-dehydrocholesterol reductase gene
EMT	Epithelial–mesenchymal transition
EPCD	5,9-endoperoxy-cholest-7-en-3β,6α-diol
ER	Endoplasmic reticulum
ERK	Extracellular signal-regulated kinase
GC-MS	Gas chromatography–mass spectrometry
GFAP	Glial fibrillary acidic protein
GI	Gastrointestinal
GR	Glucocorticoid receptor
HDL	High-density lipoprotein
Hh	Hedgehog
hiPSCs	Human induced pluripotent stem cells
HMG-CoA	Hydroxymethylglutaryl-CoA
IF1	Inhibitory factor 1
iPSCs	Induced pluripotent stem cells
IUGR	Intrauterine growth restriction
LC-MS/MS	Liquid chromatography–tandem mass spectrometry
LOVD	Leiden Open Variation Database
LPS	Lipopolysaccharides
MALDI-MSI	Matrix-assisted laser desorption ionization mass spectrometry imaging
MAP2	Microtubule-associated protein 2
MEK	Mitogen-activated protein kinase kinase
MRI	Magnetic resonance imaging
mRPE	Monkey retinal pigment epithelium
mTORC1	Mammalian target of rapamycin complex 1
PT	Pregnanetriol
RPE	Retinal pigment epithelial
RPE-65	Retinal pigment epithelium-specific 65 kDa protein
RTK	Receptor tyrosine kinase
SHH	Sonic Hedgehog
SLOS	Smith–Lemli–Opitz syndrome
SMA	α-smooth muscle actin
Smad2	Mothers against decapentaplegic homolog 2
SREBPs	Sterol regulatory element-binding proteins
SSS	SLOS Severity Score
SYP	Synaptophysin
TGF-β	Transforming growth factor beta
THCEO	3β,5α,9α-trihydroxycholest-7-en-6-one
TLR4	Toll-like receptor 4
TOF-SIMS	Time-of-flight secondary ion mass spectrometry
TUBB3	Tubulin Beta 3 Class III
TβR-I	TGF-β receptor I
TβR-II	TGF-β receptor II
US	Ultrasound imaging
Wnt	Wingless/integrated
Δ8-isomerase	Steroid 8-isomerase
CVS	Chorionic villus sampling