Figure 4.

Decreased cytotoxicity of purified natural killer cells from Behçet’s disease patients. NK cells were isolated from BAL cells by magnetic-activated cell sorting. Cytotoxicity and lymphokine-activated killer activity were determined as described in Figure  3. Cytotoxicity [A] and LAK activity [B] of purified NK cells were determined in 5 healthy controls, 3 patients with RA and 7 patients with Behçet’s Disease. Data are shown as box plots. Each box represents the 25^th to 75^th percentiles. Lines inside the boxes represent the mean. Whiskers represent the 10^th and the 90^th percentiles. Cytotoxicity was determined at an effector-to-target (E:T) cell ratio of 10:1, 5:1 and 2.5:1.