6IY5:
reference: Minidumbbell structures formed by ATTCT pentanucleotide repeats in spinocerebellar ataxia type 10., Guo P, Lam SL, Nucleic Acids Res. 2020 Jun 10. pii: 5855638. doi: 10.1093/nar/gkaa495. PMID: 32520333

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).