Rank the following compounds in order of decreasing reactivity in nucleophilic addition reactions, starting with the most reactive compound. 
Definitions:
Gene Targeting
A molecular biology technique that uses homologous recombination to modify the genome of an organism at a precise location.
Fluorescent Dyes
Chemical compounds that absorb light at one wavelength and emit it at another, used to stain and visualize biological molecules or cells under a microscope.
Microarray
A laboratory tool used to detect the expression of thousands of genes at the same time, allowing researchers to understand complex genetic processes.
Gene Expression
The process by which information from a gene is used to synthesize a functional gene product, often a protein, influencing the cell's structure and function.
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