Refined mapping of Dp(1;Y)BSC267 Kim Cook, Russell Garton, Adam Brown, Megan Ward, Jennifer Deal, Megan Deal, Thom Kaufman & Kevin Cook Bloomington Drosophila Stock Center Indiana University We were able to map the distal end of the duplicated medial segment of Dp(1;Y)BSC267 (FBab0046955) to a smaller interval than originally reported in http://flybase.org/reports/FBrf0212746.html. It lies between the following transposon insertions and their associated flanking primers: Insertion: P{EPgy2}EY00885 Forward primer: GAGAGTGACGCTTTCTCGCGCGC ( X:13656333..13656355 ) Reverse primer: CATTATTATCATTGCGGGCAGCTGG ( X:13657098..13657122 ) Insertion: PBac{RB}jube03614 Forward primer: GTGTGACCGCCGCGGGTTACG ( X:13724330..13724350 ) Reverse primer: CAACGACATCACGCGCACC ( X:13725065..13725083 ) Consequently, the Release 5 coordinates and predicted cytological breakpoints of the ends of the duplicated medial segment of Dp(1;Y)BSC267 are X:13656333..13724330 ;15392986 and 12C1-12C6;13C5.