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UEC:

Unequal crossover

Unaffected:

An individual who does not have any symptoms of the disease or disorder of interest.

Untranslated region (UTR):

The region on either side of the coding sequence of a strand of mRNA which typically include regulatory sequences. The region on the 5’ end of the gene is called the 5’UTR, and the region on the 3’ end of the gene is called the 3’ UTR.