KIR3DL1 and autoimmune hepatitis: The apparent duality between increased activating KIRs (e.g., KIR2DS1, KIR2DS4) and decreased inhibitory KIRs (e.g., KIR2DL2, KIR2DL3, KIR3DL1) in AIH reflects the underlying complexity of immune dysregulation in this disease.