pfam13304: AAA_21 (this model, PSSM-Id:404226 is obsolete and has been replaced by 433102)
AAA domain, putative AbiEii toxin, Type IV TA system
Several members are annotated as being of the abortive phage resistance system, in which case the family would be acting as the toxin for a type IV toxin-antitoxin resistance system.