This region typically appears on the C-terminus of EF hands in GTP-binding proteins such as Arht/Rhot (may be involved in mitochondrial homeostasis and apoptosis[1]). The EF hand associated region is found in yeast, vertebrates and plants.

1: Cloning and characterization of the mouse Arht2 gene which encodes a putative atypical GTPase. Shan Y, Hexige S, Guo Z, Wan B, Chen K, Chen X, Ma L, Huang C, Zhao S, Yu L; Cytogenet Genome Res 2004;106:91-97. PMID:15218247