Imprecise excision of the progenitor insertion, resulting in deletion of the entire coding region of Arl5 including the 3' UTR and part of the 5' UTR (the 1050 base pairs 8298517-8299566 inclusive replaced by 34 base pairs of uncertain origin).
A ~1 kb deletion resulting from the imprecise excision of P{RS5}Arl55-HA-1500 reported to map to 3L:8298517-8299566 in R6 coordinates. The deleted sequence is replaced by 34 bases of unknown origin.