sister chromatid exchange

initialism: SCE
https://doi.org/10.1351/goldbook.11223

Reciprocal exchange of chromatin between two replicated chromosomes that remain attached to each other until anaphase of mitosis.

Note: SCE is used as a measure of mutagenicity of substances that produce this effect.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 805 [Terms] [Paper]