untranslated's Usage Examples:

The 5′ untranslated region (5′ UTR) (also known as a leader sequence, transcript leader, or leader RNA) is the region of an mRNA that is directly upstream.

In molecular genetics, the three prime untranslated region (3′-UTR) is the section of messenger RNA (mRNA) that immediately follows the translation termination.

In molecular genetics, an untranslated region (or UTR) refers to either of two sections, one on each side of a coding sequence on a strand of mRNA.

that are not translated, termed the five prime untranslated region (5' UTR) and three prime untranslated region (3' UTR), respectively.