This domain is found in the Zc3h12a protein which has shown to be a ribonuclease that controls the stability of a set of inflammatory genes [1]. It has been suggested that this domain belongs to the PIN domain superfamily [1]. This domain has also been identified as part of the NYN domain family [2].

1: Zc3h12a is an RNase essential for controlling immune responses by regulating mRNA decay. Matsushita K, Takeuchi O, Standley DM, Kumagai Y, Kawagoe T, Miyake T, Satoh T, Kato H, Tsujimura T, Nakamura H, Akira S; Nature;458:1185-1190. PMID:19322177

2: The NYN Domains: Novel Predicted RNAses with a PIN Domain-Like Fold. Anantharaman V, Aravind L; RNA Biol. 2006; [Epub ahead of print] PMID:17114934