SDC1 and Miyoshi myopathy: CD138 protein and mRNA levels were first assayed by flow cytometry analysis using an anti-CD138 DL-101 clone and qRT-PCR, respectively, in MM cell lines (n = 12) including paired sensitive and resistant to dex (MM1S/MM1R), IMiDs (both len and pom) (MM1S/MM1S(R), H929/H929(R)), and btz (ANBL6/ANBL6-BR)28,30 (Supplementary Fig. S1A).