Construct: Expression of w+mC is influenced by a 3kb fragment of the y regulatory region, with two 170bp XhoI-ScaI fragments of P-element sequence inserted at -340bp (relative to the y transcription start site).
Construct: A 3kb fragment of the y regulatory region, with two 170bp XhoI-ScaI fragments of P-element sequence inserted at -340bp (relative to the y transcription start site) is placed upstream of the 5kb y coding region.