BMS493	Pan Retinoic acid receptor antagonist
CRE	(Cyclization recombination) DNA recombinase
CYP26A1,B1,C1	Cytochrome P450 isoenzymes A1, B1 and C1
f	Floxed allele
FGF	Fibroblast growth factor
FNP	Frontonasal process
FOXA1/Foxa1	Forkhead box protein A1 protein/gene
GLI1-3	Glioma-associated oncogene family members 1, 2 and 3
IHH	Indian hedgehog
ISH	In situ Hybridization
K8	Keratin 8
K14	Keratin 14
LacZ	Gene encoding E. Coli β-galactosidase
n	Null allele
SAG	Smoothened agonist
SHH/Shh	Sonic Hedgehog protein/gene
SMO/Smo	Smoothened protein/gene
PS	Palatal shelf/shelves
Ptch1	Patched 1
RA	Retinoic acid
RALDH/Aldh1a	Retinaldehyde dehydrogenase protein/gene
RAR	Retinoic acid receptor
RARE	Retinoic acid response element
RT-qPCR	Reverse transcription quantitative polymerase chain reaction
RXR	Retinoid X receptor
TAM	Tamoxifen
WMISH	Whole-mount in situ hybridizationWingless/integrated 3a
4-OH-TAM	4-hydroxytamoxifen