Included within a 12.3kb SphI-XhoI genomic fragment containing the per transcription unit and approximately 4kb of upstream and promoter region and 0.8kb of downstream sequences.
Position of restriction fragment on reference sequence inferred by FlyBase curator.
In a wild-type background, 8% of flies are arrhythmic.
per01 flies carrying two copies of per+t12.3 show an increase in locomotor activity period of approximately 2 hours when moved from 20 to 27oC, whereas there is no significant difference in period in per01 flies carrying one copy of per+t12.3 compared to wild type. Flies carrying per+t12.3 have a phase response curve (PRC) that would be predicted for flies with 27 hours locomotor activity periods at 27oC.