utr5_sc_500, utr5_sc_1000, and utr5_sc_2000 are datasets consisting of the 5' untranslated regions 500, 1000, and 2000 basepairs upstream, respectively, of the start codons of the yeast coding sequences (ORFs) defined by the systematic sequencing effort. These sequences do not include the 5' ATG and correspond to the sense strand (i.e., sequences for "C" ORFs are reverse complemented). Some of these UTRs will be erroneous if the predicted ORF is not expressed or if the true 5' end starts at a different ATG. For ORFs near the chromosome termini, the 5' UTRs may not be the desire length. For example, there is only 334 bp between the left end of chrI and the start of YAL069W.

This definition is in context to Yeast Genome. See more contextual defintions for UTR5_sc.