Imprecise excision of P{drl.P423} deleting most of the element leaving only 30 nucleotides from the P-element ends which creates an in-frame stop codon. Encoded product predicted to be 47 amino acids long, with 35 amino acids from drl and 12 amino acids from P-element.
Mushroom bodies of drlexc21/drl2 adults show similar defects to those of drl2. Embryonic central nervous system defects are identical to those of drl null mutants. drlexc21 and drl2 homozygotes and drlexc21/drl2 transheterozygotes show comparable mean memory retention scores (16+-4, 17+-3 and 18+-4 respectively, Canton S being 66+-2) after classical conditioning of an olfactory avoidance response.
drlexc21 is partially rescued by drlUAS.cCa/Scer\GAL47B