
Dictionary » M » Macronucleus MacronucleusMacronucleus The larger nucleus (or sometimes nuclei) in ciliate protozoans. Derived from the micronucleus by a process of dna polytenisation. The dna in the macronucleus is actively transcribed. The macronucleus degenerates before conjugation. Part of the nuclei in protozoans responsible for cell division. ![]()
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