Citing the Blepharisma stoltei genome:

Ref: 36669098: Singh, M., Seah, B. K. B., Emmerich, C., Singh, A., Woehle, C., Huettel, B., Byerly, A., Stover, N. A., Sugiura, M., Harumoto, T., & Swart, E. C. (2023). Origins of genome-editing excisases as illuminated by the somatic genome of the ciliate Blepharisma. Proceedings of the National Academy of Sciences of the United States of America, 120(4), e2213887120. https://doi.org/10.1073/pnas.2213887120