BM-hMSC	Bone marrow-derived human mesenchymal stem cell
PCOS	Polycystic ovary syndrome
BMP2	Bone morphogenetic proteins 2
ELISA	Enzyme-linked immunosorbent assay
qRT-PCR	Quantitative real-time polymerase chain reaction
IHC	Immunohistochemistry
IL-1β	Interleukin-1 beta
IL-6	Interleukin-6
MSC CM	Mesenchymal stem cell conditioned medium (secretome)
FBS	Fetal bovine serum
PBS	Phosphate-buffered saline
UIC ACC	University of Illinois at Chicago Animal Care Committee
LTZ	Letrozole
H & E	Hematoxylin–eosin