Isolation and characterization of Df(3L)BSC416 Stacey Christensen, Kim Cook and Kevin Cook Bloomington Stock Center Indiana University Df(3L)BSC416 was isolated as a FLP recombinase-induced recombination event involving PBac{WH}f05394 and P{XP}d10512. The deletion was isolated as a chromosome lacking miniwhite markers in progeny of w1118; Dr1/TM6C, Sb1 females crossed to P{hsFLP}1, y1 w1118; PBac{WH}f05394/P{XP}d10512 males. The males were heat shocked as larvae as described in Parks et al., Nature Genetics 36: 288-292, 2004 (FBrf0175003). This cross and crosses in preceding and succeeding generations maintained the original genetic background of the Exelixis insertion stocks (Thibault et al., Nature Genetics 36: 283-287, 2004; FBrf0175002). The recombination event generated the genetic element P+PBac{XP5.WH5}BSC416 from the segment of PBac{WH}f05394 to the left of its FRT site and the segment of P{XP}d10512 to the right of its FRT site. Its presence was verified using the PCR methods and primers described in Parks et al. The cytological breakpoints of Df(3L)BSC416 predicted from the Release 5 genomic coordinates of the transposable element insertions sites are 75D2;75E4. Df(3L)BSC416 failed to complement not02069 and ftz-f103649.