Soluble protein fractions from lysates of unstimulated or IL-7 stimulated D1 cells were analysed by 2D Western blot analysis and Coomassie blue gel staining as described in Materials and Methods. A, Unstimulated cells, Coomassie blue staining; B, Unstimulated cells, immunoblot with anti-phosphotyrosine MoAb; C, IL-7-stimulated cells, Coomassie blue staining; D, IL-7-stimulated cells, immunoblot with anti-phosphotyrosine MoAb. Spots are numbered as reported in Table 1, showing protein identification. Representative of 3 experiments.