Sequence alignment of the synaptotagmin homology group with ClustalW: yellow arrows correspond to β-strands in the C2A domain; gold arrows correspond to β-strands in the C2B domain; green waves correspond to the flexible linker. Blue helices correspond to α-helices. Syt3, mouse synaptotagmin III (294–588) (Swiss-Prot: SYT3_MOUSE); Syt1, mouse synaptotagmin I (271–421) (Swiss-Prot: SYT1_MOUSE); Syt4, rat synaptotagmin IV (152–425) (Swiss-Prot: SYT4_RAT); Syt5, rat synaptotagmin V (105–386) (Swiss-Prot: SYT3_RAT); Syt6, rat synaptotagmin VI (226–511) (GenBank: U2O105); Syt7, rat synaptotagmin VII (129–403) (GenBank: U20106); Syt8, mouse synaptotagmin VIII (61–355); Syt11, rat synaptotagmin XI (152–430) (GenBank:AF000432); rab3A, rat rabphilin-3a (383–684) (SWISS-PROT: RP3A_RAT); doc2, mouse doc2 (125–412) (PIR: JC4921).