The region of the transcript from the 5’ cap to the nucleotide just upstream of the start codon is called the 5’ untranslated region (5’UTR) because it is part of the transcript that is not translated. How long (in ribonucleotides) is the 5’UTR?
In ribonucleotides, meaning in the mRNA, in prokaryotes, the 5'UTR are 3 - 10 nucleotides long in the prokaryotes but in the eukaryotes, the 5' UTR region varies between a hundred to thousands nuclotides long.
