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.
Being mutant at Pvf1 enhances both the penetrance and expressivity of the terminalia phenotype that results from expression of PvrDN.Scer\UAS under the control of Scer\GAL4en-e16E or Scer\GAL4dpp.blk1.