Dose–response experiments. Total PB NK cells were treated with serial dilutions (1:2) of sHLA-G (range, 100-6.25 ng/mL). Cytofluorimetric analysis of CXCR3 (A), CX3CR1 (B), CD94 (A), and NKG2A (B) expression was performed. Data are expressed as MRFI. Means of 3 different experiments ± SD are shown. Asterisks indicate significant differences.