βTub85D promoter sequences drive expression of Cdk1 that has been mutated so it cannot be phosphorylated on residue Y15. The protein is tagged with GFP.
fusome | adult stage | male
spermatocyte
Cdk1Y15F.βTub85D.T:Avic\GFP expression results in obvious fusome defects in stage S5-S6 spermatocytes.