Figure 3. Differences of RNA-binding motif protein 3 (RBM3) protein expression in various human breast cancer cell lines by western blot analysis. RBM3 protein is markedly increased in MCF-7 and T47D (luminal A subtype) and ZR-75-1 (luminal B subtype). On the other hand, RBM3 protein is significantly reduced in HCC1954 (HER2-enriched type) and BT-20 (basal-like subtype).