This domain is found in the glucocorticoid-responsive protein regulated endocrine-specific protein 18 (RESP18) and in the N-terminal extracellular region of receptor-type tyrosine-protein phosphatases containing the protein-tyrosine phosphatase receptor IA-2 domain (Pfam:PF11548) [1,2].

1: Requirement of regulated endocrine-specific protein-18 for development and expression of regulated endocrine-specific protein-18 isoform c in mice. Liang M, Yang JL, Bian MJ, Liu J, Hong XQ, Wang YC, Huang YF, Gu SP, Yu M, Huang F, Fei J; Mol Biol Rep. 2011;38:2557-2562. PMID:21104147

2: RESP18, a homolog of the luminal domain IA-2, is found in dense core vesicles in pancreatic islet cells and is induced by high glucose. Zhang G, Hirai H, Cai T, Miura J, Yu P, Huang H, Schiller MR, Swaim WD, Leapman RD, Notkins AL; J Endocrinol. 2007;195:313-321. PMID:17951542