humpty dumpty Is Required for Developmental DNA Amplification and Cell Proliferation in Drosophila

and Brian R. Calvi1, * as BrdU foci within follicle-cell nuclei beginning at oo-genesis stage 10B, when most other origins are not1Department of Genetics University of Pennsylvania School of Medicine active (Figure 1B) [6, 7]. This indicated that fs(3)272-9 has a severe defect in amplification (Figure 1D).Philadelphia, Pennsylvania 19104 2Department of Molecular and Cell Biology The analysis of more severe alleles of fs(3)272 indi-cated that it also has an essential function earlier inUniversity of California, Berkele