Many of us have had the experience of trying to reconstruct what someone has done and been frustrated trying to find the exact sequence. Relative coordinates do not last: gene models often change so that “Leu234” in a protein is no longer there and our knowledge of genome sequence changes (or we are working with a different strains) so the EcoR1 site 5’ to your favorite gene is not there. There is an easy solution: always specify a location by sequence. Thirty nucleotides is sufficient in essentially all cases to uniquely locate the site. Your simple effort in specifying a genome location by sequence, when you are writing a paper will make experiments easily reproducible, as well as help WormBase in curating such studies.