3D	three-dimensional
ALI	air-liquid interface
DMEM	Dulbecco’s Modified Eagle Medium
ECM	extracellular matrix
EMEM	Eagle’s Minimum Essential Medium
FBS	fetal bovine serum
HC	histochemical staining
HEMa	human epidermal melanocytes, adult
HEKn	human epidermal keratinocytes, neonatal
H&E	hematoxylin and eosin
HKGS	human keratinocyte growth supplement
HPLC-MS	high-performance liquid chromatography–mass spectrometry
HPLC-PDA	high-performance liquid chromatography–photodiode array detector
IDO-1	indoleamine 2,3-dioxygenase 1
IFN-γ	interferon-gamma
IHC	immunohistochemical staining
IL-6	interleukin-6
Kyn	kynurenine
mc	melanocyte model
mm	melanoma model
NAD+	nicotinamide adenine dinucleotide
PEST	penicillin–streptomycin
RT	room temperature
RT-qPCR	reverse transcriptase quantitative polymerase chain reaction
Trp	tryptophan
UV	ultraviolet