Deletion of part of the extracellular domain 2 (amino acids 449-740) as well as the cleavage site (therefore protein tethered to membrane) of the Appl coding region.
When Applsd.Scer\UAS is driven by Scer\GAL4sca-537.4 a strong bristle transformation phenotype is seen.
When expression is driven in the motoneurons muscles 6 and 7 (abdominal segment 3) total number of synaptic boutons is slightly increased, percentage of satellite boutons is increased and the number of normal boutons is slightly increased.