text: d 
  linker pre-toxin (PT-TG) domain, as well as a hypervari-
  able C-terminal region containing the toxin domain. Of 
  the six putative toxins, four contain nuclease-fold C-ter-
  minal domains, including the RNase Ntox50 (PF15542), 
  as well the tox-SHH (PF15652), -G