Tolerance and pregnancy article 8 female 8 human 8 human cell 8 peripheral blood mononuclear cell 8 trophoblast 8 Coculture Techniques 6 Female 6 Humans 6 Pregnancy 6 Trophoblasts 6 Vasoactive Intestinal Peptide 6 Western blotting 6 coculture 6 controlled study 6 inflammation 6 leukemia inhibitory factor 6 nitrite 6 priority journal 6 vasoactive intestinal polypeptide 6 CD4+ T lymphocyte 4 CD4-Positive T-Lymphocytes 4 Chemokines 4 Dose-Response Relationship, Drug 4 Early pregnancy 4 Embryo Implantation 4 Human implantation 4 Immune Tolerance 4 Leukocytes, Mononuclear 4