The P{SUPor-P} insertion is 111bp upstream of the dimm gene.
Mutants show loss of expression of P{FMRFa-EGFP.Tv}, a marker for the six Ap4 neurons in the developing ventral nerve cord, and loss of expression of eya, which identifies the four Ap cluster neurons.
The number of SE2 neurons is normal in dimmKG02598 mutant animals.
The neuropeptide expression phenotype is revertable on excision of the P{SUPor-P}.