A 9,294 bp deletion removing the majority of the TyrRII coding sequence along with the final 758 bp of the predicted 1984 bp TyrR 3' untranslated region. However, quantitative RT-PCR indicates no difference in TyrR transcript abundance in the Malpighian tubules of homozygotes compared with heterozygotes, and so this deletion is considered a specific mutation of TyrRII.