Encodes a mutated form of Orc6 (contains the amino acid replacements D224A, Y225A), which is tagged at the N-terminal end with GFP. The native Orc6 promoter and UAS regulatory sequences are fused upstream of a mutated form of Orc6 (contains the amino acid replacements D224A, Y225A), which is tagged at the N-terminal end with GFP.