Mutation in sequenced strain: frameshift (-1).
There is a -1 frameshift in CG17267 in iso-1, the reference sequence strain relative to RNA-seq reads from a different melanogaster strain (SRX029378). One base (A) is missing between 3R:20737802 and 3R:20737803 in iso-1. This leads to a frameshift after codon 218 and early translation termination after the addition of 20 novel amino acids.