Imprecise excision of the P{EPgy2} element, resulting in a 1.5kb deletion which removes the first non-coding exon and part of the first intron of NPC1 and removes the first third of the Pros35 transcript.
The lethal phase of homozygous larvae is unaffected if they are fed dietary 20-hydroxyecdysone or if they are fed standard food supplemented with 200ng/ml cholesterol.