FlyBase curator comment: this entry is used to capture phenotypic information when the particular allele (or allele combination) used by the author could not be determined but the context of the experiment suggests that the phenotype being described is some kind of loss of function.
Most germaria lack germ cells but still have a few developing egg chambers in mutant females.
In piwiunspecified lack15C double mutant ovaries, most germaria contain supernumerary germline stem cells (GSCs) and a continuous supply of egg chambers, resembling the lack15C single mutant phenotype.