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.
Mutant germ-line clones fail to develop. Somatic clones in the wing or eye imaginal discs also do nor develop, the largest clones being isolated being 5 cells (compared to their twin-spot clones being hundreds of cells).