Multiple-sequence alignment of the shuttle domains of Erv1/ALR proteins from S. cerevisiae (NP_011543.2), G. clavigera kw1407 (EFX00923.1), H. magnipapillata (XP_002163122.1), A. mellifera (XP_001120016.1), S. purpuratus (XP_786637.1), D. rerio (NP_001082855.1), X. laevis (BC_097922.1), G. gallus (XP_414848.2), R. norvegicus (NP_037354.2), and H. sapiens (NP_005253.3). Cysteines of the shuttle redox center are marked with blue stars. Alignments were performed with ClustalW and ESPript.