ACAN	Aggrecan
AF	Annulus fibrosus
AFC	Annulus fibrosus cells
ALP	Alkaline phosphatase
ALZR	Alizarin red S
BGLAP	Osteocalcin
BMP	Bone morphogenetic protein
CEP	Cartilaginous endplate
CEPC	Cartilaginous endplate cells
CHRD	Chordin
COL1	Collagen type 1
COL2	Collagen type 2
FBS	Fetal bovine serum
FST	Follistatin
GREM1	Gremlin 1
GREM2	Gremlin 2
IVD	Intervertebral disc
KRT18	Cyto-keratin 18
LG-DMEM	Low glucose-Dulbecco’s Modified Eagle Medium
MSC	Mesenchymal stromal cells
NP	Nucleus pulposus
NPC	Nucleus pulposus cells
OB	Osteoblast
P/S	Penicillin/streptomycin
qPCR	Quantitative polymerase chain reaction
RUNX2	Runt-related transcription factor 2
SD	Standard deviation
SEM	Standard error of mean
SPP1	Osteopontin
TWSG1	Twisted gastrulation BMP signaling modulator 1