This ubiquitin-like domain is found in several ubiquitin carboxyl-terminal hydrolases [1] and in gametogenetin-binding protein.

1: Structure of the USP15 N-terminal domains: a beta-hairpin mediates close association between the DUSP and UBL domains. Harper S, Besong TM, Emsley J, Scott DJ, Dreveny I; Biochemistry. 2011;50:7995-8004. PMID:21848306