Blotting, Western 6 Cell Line, Tumor 6 Female 6 Humans 6 Leptin 6 Placenta 6 article 6 cell strain JEG 3 6 controlled study 6 human 6 human cell 6 leptin 6 Base Sequence 4 Bewo cell 4 Chorionic Gonadotropin 4 Cyclic AMP 4 Cyclic AMP-Dependent Protein Kinases 4 DNA Primers 4 EPAC protein 4 Enzyme Activation 4 Guanine Nucleotide Exchange Factors 4 MAP Kinase Signaling System 4 Pregnancy 4 Rap1 protein 4 Real-Time Polymerase Chain Reaction 4 cell line 4 chorionic gonadotropin 4 cyclic AMP 4 cyclic AMP dependent protein kinase 4 cyclic AMP dependent protein kinase inhibitor 4