ACT	Activin
ALKR	Activin receptor
BDNF	Brain-derived neurotrophic factor
ECM	Extracellular matrix
EGFR	Epidermal growth factor receptor
ESC	Epidermal stem cell
GDF	Growth differentiation factor
GF	Growth factor
HDAC	Histone deacetylase
IGR	Insulin-like growth receptor
IL	Interleukin
IR	Insulin receptor
MAPK	Mitogen-activated protein kinase
MMP	Matrix metalloproteinase
MSC	Mesenchymal stem cell
NGF	Nerve growth factor
NLR	Nucleotide-binding oligomerization domain-like receptor
ROS	Reactive oxygen species
SC	Stem cell
TGF	Transforming growth factor
TNF	Tumor necrosis factor
TRPA	Transient receptor potential ankyrin
TRPV	Transient receptor potential vanilloid
UV	Ultraviolet
VEGF	Vascular endothelial growth factor