To further corroborate the mRNA data, we next performed a survey of CK1α protein expression in purified CD138+ malignant PCs from MM patients and HMCLs showing high CK1α protein levels expression in all the samples analyzed (Figure 1D; Table 1A summarizes the clinical features of the MM patients investigated in this set of experiments). Here, CSNK1A1 is linked to Miyoshi myopathy.