Contains two characteristic copies of the bihelical repeat forming the basic EF-hand unit. The absence of the characteristic calcium-binding motif, suggesting it could self-dimerize or dimerize with other EF-hand-containing proteins.

1: Functional Innovation in the Evolution of the Calcium-Dependent System of the Eukaryotic Endoplasmic Reticulum. Schaffer DE, Iyer LM, Burroughs AM, Aravind L; Front Genet. 2020;11:34. PMID:32117448