Fig. 2. An alignment of the amino acid sequence of the Physalia ß subunit (PpCa_Vß) (GenBank Accession number: ABD59026) with ß subunits from the scyphozoan jellyfish Cyanea capillata (CyCa_Vß [Accession Number: AAB87751]), one each from the platyhelminth Schistosoma mansoni (SmCa_Vß2 [AAK51118]), Drosophila (DmCa_Vß [AAF21096]), rabbit (Ca_Vß1 [P19517]) and human (Ca_Vß2 [AAL73495]). Conservation (100%) is indicated by white letters on a black background and greater than 80% conservation by white letters on a gray background. Residues that interact directly with the AID domain of the ₁ subunit have a red background. This alignment was obtained using ClustalX (Version 1.83) and displayed using Genedoc (Vers. 2.6.002).