Green fluorescent protein
A reporter of gene expression — The expression of a gene can be monitored in cells by linking the control sequences for a gene to the GFP structural gene, which serves as a reporter.
A protein tag — The GFP structural gene is fused to another gene, producing a fusion protein that is tagged by GFP. The location of this tagged gene can be seen within living cells.
Thus, the fluorescence produced by GFP can serve to reveal where a particular protein is expressed and to monitor protein-protein interactions.
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