WD repeats are short subdomains of about 40 amino acids and fold into 4 antiparallel beta hairpins. This domain here has been detected on the C-terminus of WD repeat-containing protein 18 during target selection by the Joint Center for Structural Genomics.

1: The WD repeat: a common architecture for diverse functions. Smith TF, Gaitatzes C, Saxena K, Neer EJ; Trends Biochem Sci. 1999;24:181-5. PMID:10322433