In comparison to cells from HS, CD4+ T cells from PD patients had lower mRNA levels of the D1-like DR D5 and of the D2-like DR D3 and D4, and higher mRNA levels of the D2-like DR D3, while D1-like DR D1 mRNA levels were not different between cells from PD patients and HS (Fig. 2a). The gene discussed is CD4; the disease is Parkinson disease.