The native Orc6 promoter and UASt regulatory sequences are fused upstream of a hybrid protein composed of the N-terminal 206 amino acids of Hsap\ORC6 fused to the C-terminal 52 amino acids of Orc6. The hybrid contains a deletion of the 30 amino acids between Serine 120 and Lysine 150 and Serine is also mutated to Arginine. The coding sequence is tagged at the N-terminal end with GFP.