5' region of 8.0kb fragment up to the SstII site (in exon 3) is contributed by per+t8.0, central portion from SstII site to SstI site (in exon 5) pers, with remaining 3' part contributed by per+t8.0.
abnormal behavior
Those per01 flies transformed with this allele that show rhythmicity show short periods of 19-20hr.