Contained within a 12kb genomic XhoI-NotI fragment (NotI site from cloning vector polylinker). The XhoI site lies approximately 4.5kb 5' to the initiating codon of the Ras85D gene.
12kb rescue fragment initiates at a XhoI site 4.5kb upstream of Ras85D and extends to a point about 5kb downstream of Ras85D. The 3' restriction site used is a vector site. Therefore the 3' rescue fragment endpoint is approximate.