Macronucleus

**Definition:** The larger of two types of nuclei in ciliate protozoans. It is the transcriptionally active nucleus of the vegetative cells as distinguished from the smaller transcriptionally inert GERMLINE MICRONUCLEUS.

**Tree numbers:** - A11.284.430.106.550 - A11.284.430.214.190.875.117.550

**Synonyms:** - Macronuclei