DPP is present in the immunoprecipitate complex brought down by anti-annexin 2 and protein A-Sepharose. Immunoprecipitates with either nonspecific IgG or anti-annexin 2 were resolved on SDS-PAGE, transferred to nitrocellulose, and probed with anti-DPP. Lane 1, molecular mass standards; lane 2, the immunoprecipitate brought down with nonspecific IgG; lane 3, the immunoprecipitate brought down with anti-annexin 2.