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.
Embryos exhibit defects in gut development.
The Malpighian tubule primordium is normal in size but does not form tubules in homozygous embryos, forming a sac instead.
4 mutants are isolated.