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The expression of KIR receptors KIR2DL1, NKG2A, and ILT-2 and the coexpression of NKG2A with KIR2DL1 on idNK cells cultured with 400 ng/ml of sildenafil citrate (SC). CG: control group: (a) n = 22, (b) n = 24, (c) n = 23, and (d) n = 17; RPL: recurrent pregnancy loss patients: (a) n = 20, (b) n = 22, (c) n = 18, and (d) n = 14.
