Insertion in the first intron.
fonMB11923 homozygotes are lethal, pupae are curved and elongated, as shown by a significant increase in the length/width axial ratio, and wandering third instar larvae present significant detachment and rounding of myofibers and a significant increase in the hemisegmental gap between dorsal oblique muscles 1 and 2 without any associated detachment of the actin cytoskeleton from the sarcolemma, as compared to controls.
fonMB11923/Df(2L)Exel6043 transheterozygous wandering third instar larvae present an increase in the frequency of detachment and rounding of myofibers, as compared to controls.
Homozygous pupae are elongated and bent.
The survival of homozygous larvae after wounding at the feeding stage is not significantly different from that of wild-type controls in this assay.
Hemolymph from homozygous and fonMB11923/Df(2L)Exel6043 wandering larvae produces longer fibres than can be drawn from wild-type larvae in a drawout assay testing coagulation.