AA-dUTP sodium salt is widely used in molecular biology for labeling DNA probes. It is incorporated into DNA strands during enzymatic reactions, such as PCR or nick translation, to introduce modified nucleotides. This modification allows for the attachment of detectable markers, such as fluorescent dyes or biotin, enabling applications in fluorescence in situ hybridization (FISH) and microarray analysis. Additionally, it is utilized in studies involving DNA sequencing and detection, providing a versatile tool for visualizing and analyzing nucleic acids in research and diagnostic settings.