Menstrual blood closely resembles the uterine immune micro-environment and is clearly distinct from peripheral blood

Endometrial NK Cells Are Special Immature Cells That Await Pregnancy

(2014) I. Manaster et al.   JOURNAL OF IMMUNOLOGY

Menstrual Blood as a Potential Source of Endometrial Derived CD3+ T Cells

(2011) Steffanie Sabbaj et al.   PLoS One

Review: The Immunomodulatory Roles of Macrophages at the Maternal—Fetal Interface

(2010) Takeshi Nagamatsu et al.   Reproductive Sciences

Decidual CD8+CD28− T cells express CD103 but not perforin

(2009) Tamara Tilburgs et al.   HUMAN IMMUNOLOGY

Immune cells in the placental bed

(2009) Judith N. Bulmer et al.   INTERNATIONAL JOURNAL OF DEVELOPMENTAL BIOLOGY

Proportional change of CD4+CD25+ regulatory T cells in decidua and peripheral blood in unexplained recurrent spontaneous abortion patients

(2007) Hui Yang et al.   FERTILITY AND STERILITY