Defective nuclei produced during the TELOPHASE of MITOSIS or MEIOSIS by lagging CHROMOSOMES or chromosome fragments derived from spontaneous or experimentally induced chromosomal structural changes.

Synonyms: Micronuclei, Chromosome-Defective, Micronucleus, Chromosome-Defective, Genotoxicant Induced Micronuclei, Genotoxicant-Induced Micronuclei, Chromosome-Defective Micronucleus, Micronucleus, Genotoxicant-Induced, Micronuclei, Chromosome Defective, Micronuclei, Genotoxicant-Induced, Micronucleus, Chromosome Defective, Chromosome-Defective Micronuclei, Genotoxicant-Induced Micronucleus, Micronuclei, Genotoxicant Induced, Chromosome Defective Micronuclei