Deletion of an 'A' residue, resulting in a frameshift.
Mutation in sequenced strain: frameshift (-1).
There is a -1 frameshift in Or98b in iso-1, the reference sequence strain relative to the Ives strain. An A base is missing between 3R:28352751 and 3R:28352752 in iso-1. This leads to a frameshift at codon 153 and early termination shortly thereafter.
The Or98b1 mutation is present in the strain used in the genome sequencing project.