TRBC1 and Huntington disease: Patients that could be finally classified into a precise WHO diagnostic category of T-CLPD (n = 79), as well as HD in whom a minor population of clonal Tαβ-cells was detected in blood in this study (n = 10), were divided into two groups according to their TRBC1 expression profile for the clonal Tαβ-cells: TRBC1+ vs. TRBC1− (Table 5).