nurse cell & chromatin
Egg chambers arrest at stage S7-8. Nurse cell nuclear chromatin in the oldest egg chambers appears as five blobs of chromatin, with variable ploidy.
Abnormalities in follicle cell migration: open ended chorion.
cup13 is a suppressor of female sterile | recessive phenotype of Rbp9B
Rbp9B, cup13 has female semi-fertile phenotype