RAW264.7 cells stably expressing empty vector, FLAG-tagged PKD1, FLAG-tagged PKD2, or FLAG-tagged PKD3 were stimulated with medium (med) or CpG-B DNA for 30 min. A, FLAG-tagged PKD family proteins in the cell lysates were immunoprecipitated. The presence of proteins in the TLR9-signaling pathway and phosphorylated forms of PKD in the resulting immunoprecipitates were detected by Western blot. B, The indicated endogenous proteins in the TLR9-signaling pathway in the cell lysates were immunoprecipitated. The presence of FLAG-tagged PKD family proteins and proteins in the TLR9-signaling pathway in the resulting immunoprecipitates were detected by Western blot.