microvillus & follicle cell
20-30% of eggs laid by homozygous females are collapsed at or soon after oviposition, and the remainder are very fragile to handling, but do not usually collapse unless in a dry environment.
Stage 10A mutant egg chambers show a "boulders and gaps" appearance of the vitelline bodies. During coalescence of the vitelline membrane during stage 10B, there appears to be trapping of microvilli within the vitelline membrane. The final vitelline membrane does not contain gaps, and the architecture of the chorion layers is normal.
The follicle cells of stage 10A homozygous egg chambers show grossly disorganised microvilli. There is a widening of the perivitelline space between the oocyte and the follicle cell epithelium compared to in wild type.