Mutant animals die at 29oC and lay flaccid egs at 25oC. Casts28/Df(2L)H20 animals exhibit specific cell fate transformations in mechano-sensory organs. 92% of macrochaetae and microchaetae show a transformation of shaft cells to sockets cells. Triple sockets and quadruple sockets are also seen caused by transformations of the sheath cell and eo neuron to the tormogen fate.
Phenotypic analysis provides an allelic series: Cask03902/Df(2L)H20 > CasEMS25 > Casts28/Df(2L)H20 > CasEMS39.