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Relationship between the PD-1 receptor and the PD-L1 ligand on the surface of different T cell throughout pregnancy and in nonpregnant women. Linear regression analyses between the expression of PD-1 and PD-L1 surface molecules in CD8+T cells (A), CD4+T cells (B), NKT-like cells (C) and Treg cells (D) in women during healthy pregnancy and in nonpregnant women. p values and coefficients of determination (R2) were calculated in R.
