To investigate whether increasing the number of CAG repeats would alter SAFB1 binding, we transfected neuroblastoma cells with constructs encoding full‐length ATXN1 mRNA constructs with either 30 (control ATXN1‐30Q) or 85 polyglutamine (disease ATXN1‐85Q) repeats (ref) and carried out SAFB1 immunoprecipitation followed by qPCR for ATXN1 (Figure 7C). The gene discussed is ATXN1; the disease is neuroblastoma.