Figure 4

System y⁺L and y⁺ activities in alveolar macrophages (AM) and in fibroblasts obtained from the LPI subject. Arginine uptake was assayed in AM or fibroblasts from different healthy donors (n = 3) or from the LPI patient (2 experiments on AM and 3 on fibroblasts) and system y⁺L and system y⁺ transport activities were determined as described in Figure 3..