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A researcher constructs a recombinant plasmid containing a human gene that codes for a therapeutic protein. The plasmid includes a promoter that is recognised by bacterial RNA polymerase. The researcher also inserts a gene encoding green fluorescent protein (GFP) under the control of the same promoter. After transforming bacteria with this plasmid, describe how the researcher could use the GFP marker gene to confirm that the human gene has been taken up and expressed by the bacterial cells.