Micronucleus (MCN) is a kind of abnormal structure in eukaryotic cells, and it is a form of chromosome aberration in interphase cells. Micronucleus is often produced by various physical and chemical factors, such as radiation and chemicals. Micronucleus test is used in radiation damage, radiation protection, chemical mutagen, new drug test, food additive evaluation, chromosome genetic disease and precancerous diagnosis.

Virus packaging is a technology of gene diagnosis and gene therapy. It is mainly to introduce exogenous gene DNA or RNA fragments into target cells or tissues to study the up regulation or inhibition of target gene.