Imprecise excision of the P{lacW} element resulting in a deletion within the bl transcription unit.
viable (with HnRNP-Kv2)
visible (with HnRNP-Kv2)
leg (with HnRNP-Kv2)
wing (with HnRNP-Kv2)
blv1/blv2 flies are viable. The size of the legs and wings is almost wild type (they are smaller than normal). The eyes are normal.