In three genomes so far, a member of this protein appears in the midst of a CRISPR-associated (cas) gene operon, immediately upstream of a member of family TIGR01875 (CRISPR-associated autoregulator, DevR family). The genomes so far are Nocardia farcinica IFM10152, Clostridium perfringens SM101, and Clostridium tetani E88.