The expression of DAAMUAS.cMb under the control of Scer\GAL4elav-C155 alone does not significantly affect the larval muscle 4 neuromuscular junction's morphology or bouton number, as compared to controls.
The larval muscle 4 neuromuscular junctions in DAAMEx68 hemizygous males expressing DAAMUAS.cMb under the control of Scer\GAL4btl.PS larvae show fragmented/absent presynaptic microtubules bundles and 'bouton fusion', as compared to controls. Synaptic transmission across this junction show a significant decrease in evoked excitatory junction current amplitude, but do not show significant changes in evoked excitatory junction current frequency or in miniature excitatory junction current amplitude, as compared to controls.