Fluorescent labeled nucleotide is a class of nucleotides that have been tagged with fluorescent dyes, allowing for visualization in a variety of biological applications. Fluorescent labels include Cy5, TAMRA, ROX, and 6-FAM. These nucleotides can be incorporated into oligonucleotide or nucleic acid for techniques such as fluorescence in situ hybridization (FISH) or DNA microarrays, targeted delivery or immobilization.