Amino acids 1-31 and 46-54 have been deleted.
When CycAα1-31,39-44.Scer\UAS is driven by Scer\GAL4prd.RG1 a slight delay in mitosis 16 is seen. An extra S phase is detected (by BrDU incorporation) followed by an extra M phase. This division is aberrant.
Scer\GAL4prd.RG1/CycAδ1-31,46-54.UAS partially rescues CycAunspecified
The addition of this mutant transgene to CycAunspecified mutants allows the progression into mitosis 16, although it also results in enrichment of metaphase figures and frequently interferes with successful completion of cell division.