Natural killer (NK) cell degranulation assay. X-axis, CD107a; y-axis, CD56. Note that the patient only shows 0.17% degranulation, the control 31.17%. Degranulation >15% is considered normal, 5 to 15% abnormal and possibly pathological, requiring additional testing, and <5% deficient.
Bode et al. Arthritis Research & Therapy 2012 14:213 doi:10.1186/ar3843