α-TCP	α-tricalcium phosphate
CAT	Catalase
CEP55	Centrosomal protein 55 kDa
cKIT	KIT proto-oncogene receptor tyrosine kinase
CPAs	Cryoprotectant agents
CSF	Controlled slow freezing
DMSO	Dimethyl sulfoxide
DNA	Deoxyribonucleic acid
EG	Ethylene glycol
Egr4	Early growth response-4
FACS	Fluorescence-activated cell sorting
Foxo1	Forkhead box protein O1
FP3	Freezing protocol 3
FP3	Freezing protocol 3
FSH	Follicle-stimulating hormone
FSHR	Follicle-stimulating hormone receptor
GDNF	Glial cell-line derived neurotrophic factor
GFL	GDNF family ligand
GFP	Green fluorescence protein
GFRα1	Glial-derived neurotrophic factor family receptor alpha 1
GnRH	Gonadotropin-releasing hormone
GPI	Glycosyl phosphadidoinositol
GSH-Px	Glutathione peroxidase
H2O	Water
H2O2	Hydrogen peroxide
HPG	Hypothalamus-pituitary-gonad
ICSI	Intracytoplasmic sperm injection
IHC	Immunohistochemistry
IP2	Isolation protocol 2
KS	Klinefelter syndrome
LH	Luteinizing hormone
MCS	Methylcellulose culture system
mRNA	Messenger RNA
mTORCH1	Mammalian target of rapamycin complex 1
O2	Oxygen
ObSSC	Opsariichthys bidens spermatogonia stem cell
PCPB	Prepubertal cancer patient boy
PCR	Polymerase chain reaction
PLZF	Promyelocytic leukemia zinc finger
POK	POZ-Krüppel (POK) family
POZ	Poxviruses and Zinc-finger
PSPN	Persephin
RA	Retinoid acid
RARα	Retinoic acid receptor α
RARγ	RA receptor gamma
RET	Rearranged during transfection
rHSA	Recombinant human serum albumin
rHSA	Recombinant human serum albumin
RNA	Ribonucleic acid
ROS	Reactive oxygen species
RT	Room temperature
SCO	Sertoli cell-only
SFK	SRC-family kinases
SOD	Superoxide dismutase
SSCs	Spermatogonial stem cells
SSCT	Spermatogonial stem cells transplantation
TGF-β	Transforming growth factor-β
Type Aundiff Spermatogonia	Type Aundifferentiated Spermatogonia