[dnautics]

here's someone who did the deletion with CRISPR in the petri dish, and not on brain cells:

https://www.frontiersin.org/articles/10.3389/fnins.2018.0007...

and I correct myself, there is a phenotype to the deletion of the polglutamine track - the mice are dumber.

https://www.ncbi.nlm.nih.gov/pubmed/16403806/