This entry represents a rare CRISPR-associated protein. So far, members are found in Geobacter sulfurreducens and in two unpublished genomes: Gemmata obscuriglobus and Actinomyces naeslundii. CRISPR-associated proteins typically are found near CRISPR repeats and other CRISPR-associated proteins, have low levels of sequence identify, have sequence relationships that suggest lateral transfer, and show some sequence similarity to DNA-active proteins such as helicases and repair proteins.