Citing the Oxytricha trifallax genome:

Ref: 23382650: Swart, E. C., Bracht, J. R., Magrini, V., Minx, P., Chen, X., Zhou, Y., Khurana, J. S., Goldman, A. D., Nowacki, M., Schotanus, K., Jung, S., Fulton, R. S., Ly, A., McGrath, S., Haub, K., Wiggins, J. L., Storton, D., Matese, J. C., Parsons, L., Chang, W. J., … Landweber, L. F. (2013). The Oxytricha trifallax macronuclear genome: a complex eukaryotic genome with 16,000 tiny chromosomes. PLoS biology, 11(1), e1001473. https://doi.org/10.1371/journal.pbio.1001473