A predicted toxin domain with two membrane spanning alpha helices and RxxR, Wx[ST]IP motifs. The domain is present in bacterial polymorphic toxin systems. The toxin is usually exported by the type 2 or Photorhabdus virulence cassette (PVC)-type secretion system [1].

1: Polymorphic toxin systems: comprehensive characterization of trafficking modes, processing, mechanisms of action, immunity and ecology using comparative genomics. Zhang D, de Souza RF, Anantharaman V, Iyer LM, Aravind L; Biol Direct. 2012;7:18. PMID:22731697