Polytene chromosomes normal.
Large amplitude (up to 5nA) spontaneous ejcs occur at high frequency, evoked ejcs that are time-locked to the stimulus show significantly greater amplitude. TTX suppresses the large spontaneous ejcs and supernumerary discharges after the time-locked evoked ejc, but not the spontaneous mini ejcs, indicating that enhanced nerve excitability plays a role in the asynchronous synaptic discharge in sitter mutants. The number of ectopic nerve points in the muscles of fors, fors2 and forlsR92 correlates with excitability levels of both central neurons and motor axons.
Fails to complement the increased olfactory trap response of fors2 adults.
The differences in larval locomotion during foraging in larvae carrying different alleles of the for locus cannot be explained on the basis of muscle usage alone, and it is more likely that for affects larval ability to perceive or respond to the foraging environment.