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Molecular biology
A term of art for chromosome fragments which are not incorporated into the nucleus at the time of cell division.

The smaller nucleus in ciliate protozoans (e.g., Paramecium).


(mī-krō-nū′klē-ŭs) plural.micronuclei [″ + L. nucleus, kernel]
1. A small nucleus.
2. The smaller of the two nuclei of ciliated protozoa; it contains the chromosomes.
References in periodicals archive ?
The elevation in the frequencies of micronuclei in exfoliated buccal epithelial cells has been reported in individuals attributable to the exposure to solvents organic in nature.
Effect of various concentrations of lead nitrate on the induction of micronuclei in mouse bone marrow.
In the present study, nuclear anomalies in the erythrocytes of birds were the formation of micronuclei, notched nuclei, nuclear remnants, blebbed nuclei, condensed nuclei and binucleated erythrocytes.
Age-related increase of mitomycin C-induced micronuclei in lymphocytes from Down's syndrome subjects.
Simultaneous in situ evaluation of chemically induced polyploidy and micronuclei in Chinese hamster ovary cells.
Mechanism of micronuclei formation in polyploidizated cells of Allium cepa exposed to trifluralin herbicide.
Elevated frequencies of micronuclei and other nuclear abnormalities in buccal epithelial cells of spray painters in South India.
In the present study, the average frequency of micronuclei in buccal cells was 9.
Micronuclei (MN) test is one of the most used assays in different models to determine chromosomal damage caused by the presence of compounds and mixture of substances (Misik, et al.
The antimutagenic activity of the extract was evaluated through its effect towards the formation of micronuclei induced by methylmethanesulfonate (MMS), a mutagen.