This domain is found at the C-terminus of argininosuccinate lyase [1-2].

1: Mutational analysis of duck delta 2 crystallin and the structure of an inactive mutant with bound substrate provide insight into the enzymatic mechanism of argininosuccinate lyase. Sampaleanu LM, Yu B, Howell PL; J Biol Chem. 2002;277:4166-4175. PMID:11698398

2: Human argininosuccinate lyase: a structural basis for intragenic complementation. Turner MA, Simpson A, McInnes RR, Howell PL; Proc Natl Acad Sci U S A. 1997;94:9063-9068. PMID:9256435