| micronucleus | <cell biology> The smaller nucleus in ciliate protozoans, fully active in inheritance and passed after meiosis to conjugating pairs. Gives rise to the macronucleus or macronuclei. Genes in the micronucleus are not actively transcribed. (18 Nov 1997) |
|---|---|
| micronucleus tests | Induction and quantitative measurement of chromosomal damage leading to the formation of micronuclei in cells which have been exposed to genotoxic agents or ionizing radiation. (12 Dec 1998) |