DUX4 and alopecia: The original description of the model reported alopecia, rectal prolapse, and soft stools as commonplace in the heterozygous FLExD/+ transgenic mouse and more even more pronounced in the homozygous FLExD/FLExD line (Figure S1 and Figs. 2 and S4 in ref [48]), indicating they were linked to the low leaky levels of DUX4-fl expression that were higher in the transgene homozygote.