ALCAM	activated leukocyte cell adhesion molecule
BM	basement membrane
ECM	extracellular matrix
EMT	epithelial–mesenchymal transition
EVT	extravillous trophoblast
hCG	human chorionic gonadotropin
IGFBP-1	insulin-like growth factor binding protein-1
IL	interleukin
IVF-ET	in vitro fertilization and embryo transfer
LIF	leukemia inhibitory factor
M-CSF	macrophage colony stimulating factor
MMP	matrix metalloproteinase
mTOR	mammalian target of rapamycin
PBMC	peripheral blood mononuclear cell
PIF	pre-implantation factor
PTENP1	phosphatase and tensin homolog pseudogene 1
TIMP	tissue inhibitor of metalloproteinase
VCAM1	vascular cell adhesion molecule 1
VEGF	vascular endothelial growth factor
ZP	zona pellucida