Figure 3.
Association of IgM, Src-PTKs, and Csk with GEMs in BAL-17 cells. BAL-17 and CD45-deficient clone 12 cells were either left unstimulated (–) or stimulated (+) for 5 minutes at 37°C with 20 μg/mL (Fab′)2 fragments of antimouse IgM Ab, after which they were lysed in 0.5% Triton X-100 and subjected to sucrose gradient ultracentrifugation. GEMs (fractions 4 and 5) and heavy fractions (fractions 10-12) were separated by SDS-PAGE and blotted with Abs against Lyn, Fyn, Csk, and IgM. Control blots were performed with HRP-conjugated CTB subunit to detect the ganglioside GM1, or with Abs against paxillin and CD71. Numbers at the bottom are percentages of total molecules present in each fraction.