Deletion within the first coding exon of TkR99D (deletion extends from the start codon to the end of the exon). Sequence encoding the lexA::p65 driver has been inserted in place of the deleted sequence. A single loxP site is also present, in the following intron. Generated by excision of the loxP cassette in TI{lexA::p65}TkR99DlexA-3xP3-DsRed.