(A) Immunodetection of HeT-A/Gag protein in WT (w1118), (a) vasD1/D1; nos-Gal4>GFP-vasWT (b and c) and vasD1/D1; vas-Gal4>GFP-vasWT (d) stage 5 embryos. Selected areas of stage 5 embryos are presented in Fig 3A. Scale bar indicates 100 μm. (B) RT–PCR detection of endogenous mnk mRNA in the ovaries of WT (w1118) flies, mnkP6/P6, and vasD1/D1 mutants, as well as vasD1/D1, mnkP6/P6 double mutant flies. 18S rRNA was used as a control. (C) Morphology of vasD1/D1, mnkP6/P6 double mutant and agot2/t3 single mutant ovaries. Scale bar indicates 250 μm (related to Fig 3).