ANOVA	Analysis of variance
AOF	Animal-origin-free (medium)
CI	Confidence interval
CM	Conditioned medium
DVIU	Direct visual internal urethrotomy
ECM	Extracellular matrix
EMT	Epithelial–mesenchymal transition
EV	Extracellular vesicle
HGF	Hepatocyte growth factor
HMGA2	High mobility group AT-hook 2
IGF1R	Insulin-like growth factor-1 receptor
KGF	Keratinocyte growth factor
miRNA	MicroRNA
MSC	Mesenchymal stromal/stem cell
mTOR	Mechanistic target of rapamycin
NF-κB	Nuclear factor kappa-B
NTA	Nanoparticle tracking analysis
OMF	Oral mucosa fibroblast
OMG	Oral mucosal graft
PBS	Phosphate-buffered saline
RAS	RAS proto-oncogene family (family of small GTPases)
SD	Standard deviation
SEM	Standard error of the mean
SHED	Stem cells from human exfoliated deciduous teeth
TGF-β	Transforming growth factor-β
UEC	Urethral epithelial cell