We also found that the frequency of PD-1+ ILC2s was higher in both the PB and mPE of patients than in the PB of HD (Fig. 1C), whereas the frequency of CTLA-4+ ILC2s was higher in the mPE patients than in both the HD patients and patients’ PB (Fig. 1D). The gene discussed is PDCD1; the disease is Huntington disease.