implantation Female 8 Humans 8 human 8 Embryo Implantation 6 Pregnancy 6 article 6 controlled study 6 female 6 priority journal 6 protein expression 6 Animals 4 Decidua 4 Male 4 T-Lymphocytes, Regulatory 4 Vasoactive Intestinal Peptide 4 nonhuman 4 progesterone 4 regulatory T lymphocyte 4 vasoactive intestinal polypeptide 4 vasoactive intestinal polypeptide receptor 1 4 Argentina 2 Biomedical Research 2 CD25+ T lymphocyte 2 CD4+ T lymphocyte 2 Cardiology 2 Cell Differentiation 2 Cell Movement 2 Chemokine CCL5 2 Chemokines 2