This family has been called SPFH [1], Band 7 or PHB domain. Recent phylogenetic analysis has shown this domain to be a slipin or Stomatin-like integral membrane domain conserved from protozoa to mammals.

1: The SPFH domain: implicated in regulating targeted protein turnover in stomatins and other membrane-associated proteins. Tavernarakis N, Driscoll M, Kyrpides NC; Trends Biochem Sci 1999;24:425-427. PMID:10542406

2: Slipins: ancient origin, duplication and diversification of the stomatin protein family. Green JB, Young JP; BMC Evol Biol. 2008;8:44. PMID:18267007