P{EP}GstS1EP2223 has inserted nearby the GstS1 coding sequence.
GstS1EP2223 mutants have no effect on climbing ability.
The homozygous park25 mutant climbing defect is enhanced when heterozygous with GstS1EP2223. GstS1EP2223 mutants have no effect on climbing ability in heterozygous park25 mutants.