Insertion of the most 3' 222bp of the I-element, in inverse orientation, terminated by one TAA triplet, followed by four repetitions of the sequence TAAA. The complete insertion is 241bp and is located at the end of exon 3 at nucleotide position 1302.
Schalet.
su(f)19, su(f)16-185, su(f)28, su(f)27, su(f)25 and su(f)3 exhibit the same pattern of complementation; fail to complement any su(f) allele. The allelic state of z has no effect on complementation behaviour.