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 first 19 amino acids in the hybrid are lacking as a result of the methionine at position 20 acting as a start codon. The coding sequence is tagged at the N-terminal end with GFP.