Fig. 4. stwl was not required for bam silencing and suppressed differentiation independently of bam. Spectrosomes/fusomes are labeled red in each panel. (A) bam transcriptional reporter (green) activity in wild-type germarium. (B) bam transcriptional reporter activity in stwl bam double mutants. Arrows and arrowheads indicate GSCs and cytoblasts, respectively. (C) Germ cells (stained green with anti-Vasa) in bam mutant ovaries contained spherical spectrosomes (red). (D) Elongated fusomes indicative of cyst formation (encircled) in stwl bam mutant ovaries. DNA is blue in C,D.