Science/AAAS | Sign In

Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

[yuiami]

They harbor complete copies of their genome within two separate nuclei. The micronucleus (or MIC) gives rise both to future progeny & to the macronucleus (or MAC), wherein the DNA is shredded, rearranged, and amplified, which allows the essential core of the genome to be expressed at high levels.