Maternal expression of ApNL1 triggers apoptosis during Drosophila oogenesis. a) A single ovariole of wild-type Oregon-R fly strain. g, germarium; NC, nurse cells; O, oocyte. b) Immunostaining for cleaved Drosophila death caspase 1 (Dcp-1) during late Drosophila oogenesis of nos-Gal4 and nos>ApNL1 female flies. DAPI—cyan, cleaved Dcp-1—green. c) TUNEL assay with BrdU-Red for late stages of Drosophila oogenesis of nos-Gal4 and nos>ApNL1 female flies. Scale bar 100 µm.