IFNG and Behcet disease: When intracellular expression of IFN‐γ was analysed, the percentage of IFN‐γ producing CD56Dim and CD56Bright NK cells was higher in BD patients compared to HCs, but this only reached statistical significance in the CD56Bright subset (BD 43·92 versus HCs 30·72%) (P = 0·0255) (Fig. 3a, b).