CD4 and systemic sclerosis: Percentage of cells among the CD4+, Vγ9δ2+, and Vδ1+ T cell subsets in PBMC of 3 SSc patients (RP0-2), 3 non-SSc patients with IPF or PMR (Pt 1–3), and 6 HD that were induced to secrete IFNγ, TNFα, IL-4, or IL-9 after 4.5 h of incubation in medium alone, or with Zol or PMA (20 ng/ml) and ionomycin (0.8 μM) (P/I) are shown in Figure 1.