FIGURE 8.

G1-SL and B1-SL are heavily ubiquitinated. Western blots of co-immunoprecipitation experiments with HA-ubiquitin demonstrated that ΔNT and -SL receptors were significantly more ubiquitinated than full-length receptors. Molecular weight markers (in kDa) are shown on the left side of the blots. Equal amounts of protein (10–20 μg) were loaded in each lane for the blots shown here, and the results are from three independent experiments (± S.E. shown, *, p < 0.05; **, p < 0.01; ***, p < 0.001; ****, p < 0.0001 versus G1/B1).