E. PCM1 siRNA-treated U2OS cells were transfected with two types of plasmids (EGFP- and mCherry-tagged) that produce PCM1-WT* and PCM1-S372A*. Immunoprecipitation and subsequent immunoblotting were performed with the indicated antibodies. Quantification data is shown on the right. Statistical analysis was performed using two-tailed unpaired student's t-tests. *p<0.05, **p<0.01, n.s. not significant. 