Expression of VEGF using Western blot analysis. Representative blots of VEGF expression by plasma cells in normal bone marrow, MM, and SMM after immunoprecipitation. The ARH 77 cell line was used as an additional control. Densitometric readings for cytokine/receptor bands were obtained and corrected to the corresponding mouse immunoglobulin band (shown below the VEGF band) derived from the immunoprecipitation antibody.