Accumulation of another mHTT (GFP-HTT74Q) with a similar role as the GFPHTT72Q in Huntington's disease was observed when the GFP-HTT74Q and HDAC4 were transiently coexpressed in neuroblastoma Neuro-2a (N2a) cells (Figure 1G-I). This evidence concerns the gene HDAC4 and Huntington disease.