A 748 bp deletion including the transcription start site and 147 bp of Cyp18a1 coding sequences starting from the ATG initiation codon.
Estimated boundaries of a 748 bp deletion resulting from the imprecise excision of P{XP}Cyp18a1d07122, which removes the 5' UTR of Cyp18a1 and 147 bases of coding sequence from the ATG.