CD1D and systemic sclerosis: Similar experiments of short-term PBMC cultures revealed that a mean of 21.2, 37.3, and 45.6% (n = 5, SSc) vs 55.5, 58.1, and 54.2% (n = 2, HC) of the Vδ1+ T cells, respectively, were co-stained by PBS-47, CD1d unbound, or CD1d-OCH tetramers (Figure 4B).