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extrachromosomal

[ek-struh-kroh-muh-soh-muh l] /ˌɛk strəˌkroʊ məˈsoʊ məl/
adjective, Genetics.
1.
of or relating to DNA that exists outside the main chromosome and acts independently.
Origin
1935-1940
1935-40; extra- + chromosomal
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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