This domain was thought to be unique to the SGT1-like proteins [1], but is also found in calcyclin binding proteins.

1: The RAR1 interactor SGT1, an essential component of R gene-triggered disease resistance. Azevedo C, Sadanandom A, Kitagawa K, Freialdenhoven A, Shirasu K, Schulze-Lefert P; Science 2002;295:2073-2076. PMID:11847307