This domain is found in cation transport ATPases, including phospholipid-transporting ATPases, calcium-transporting ATPases, and sodium-potassium ATPases [1-2].

1: Physiological adaptation of an Antarctic Na+/K+-ATPase to the cold. Galarza-Munoz G, Soto-Morales SI, Holmgren M, Rosenthal JJ; J Exp Biol. 2011;214:2164-2174. PMID:21653810

2: Higher plant Ca(2+)-ATPase: primary structure and regulation of mRNA abundance by salt. Wimmers LE, Ewing NN, Bennett AB; Proc Natl Acad Sci U S A. 1992;89:9205-9209. PMID:1384045