Table 1.

Increased proportions of KIR⁺ lymphocytes and up-regulation of KIR expression at the cell surface during early pregnancy

Donors	p58.2		NKG2-A		LIR-1
	Positive cells %* (±SEM)	Mean FI (±SEM)	Positive cells %* (±SEM)	Mean FI† (±SEM)	Positive cells %* (±SEM)	Mean FI† (±SEM)
Pregnant women (n = 8)	8  (0.90)	460  (73)‡	11  (1.9)	250  (40.7)‡	24  (3.5)	122  (25.7)‡
Control women (n = 8)	5  (0.59)	253  (61.8)	10  (1.61)	145  (18.4)	17  (1.7)	58  (9.4)

FI, fluorescence intensity. 

^*The percentage of cells expressing the indicated KIR were evaluated by cytofluorimetry. 

^†Numbers indicate the mean FI as evaluated by cytofluorimetric analysis. 

^‡P < 0.05 two-tailed Student’s t test vs. control group.