As whole animals, transgenic pigs harboring human disease-causing mutant genes phenotypically replicate ALS (Yang et al., 2014), Huntington’s disease (Yan et al., 2018), AD (Lee et al., 2017), SMA (Lorson et al., 2011), and ataxia telangiectasia (Beraldi et al., 2015). The gene discussed is SMN1; the disease is juvenile Huntington disease.