VSIR and telomere syndrome: Using xMAP technology, the quantification of soluble VISTA in plasma samples was found to be superior in STS patients (47.6 pg/mL, IQR: 26.3–65.5, N = 20) than in HD controls (12.5 pg/mL, IQR: 8.6–15.2, N = 19, adj p = 0.001216) (Figure 2D).