Expression of f::necdsRNA.Scer\UAS under the control of Scer\GAL4Act5C.PI gives a null f and a null nec mutant phenotype. Expression of f::necdsRNA.Scer\UAS under the control of Scer\GAL4ptc-559.1, Scer\GAL4VNC.ap, Scer\GAL4Dll-md23 or Scer\GAL4dpp.blk1 does not give a nec mutant phenotype, but does result in a f mutant phenotype in bristles and hairs.