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• Efficient RNA Incorporation – Readily integrates into RNA transcripts via T7 RNA polymerase for robust fluorescent labeling.
• Bright, Photostable Far-Red Fluorescence – High quantum yield and photostability enable extended imaging with minimal photobleaching.
• Optimized Spectral Properties – Provides strong far-red signal with minimal spectral overlap for multiplexed applications.
• Direct Detection Without Post-Staining – Fluorescently labeled RNA is visible immediately after gel electrophoresis, eliminating additional staining steps.
• Enables Single-Molecule FRET Studies – Supports real-time monitoring of RNA folding and molecular interactions.

XFD647, manufactured by AAT Bioquest, is a far-red fluorescent dye that is structurally identical to Alexa Fluor™ 647 (ThermoFisher), offering high photostability and intense fluorescence. When conjugated to uridine triphosphate (UTP), XFD647-UTP functions as an alternative to natural UTP in T7 RNA polymerase-mediated in vitro transcription, enabling the synthesis of fluorescently labeled RNA probes. These probes are highly suited for multicolor fluorescence-based applications, including dual-color expression profiling, microarrays, fluorescence in situ hybridization (FISH), chromosome identification, whole chromosome painting, karyotyping, and gene mapping.

XFD647-UTP efficiently incorporates into RNA transcripts through T7 RNA polymerase, imparting robust fluorescence for the visualization and quantification of RNA localization, distribution, and dynamics in live or fixed-cell systems. With excitation and emission maxima at 650 nm and 671 nm, respectively, XFD647-UTP-labeled RNA is readily detectable under fluorescence microscopy and gel electrophoresis without additional post-staining. Furthermore, XFD647-UTP facilitates single-molecule fluorescence resonance energy transfer (smFRET) experiments, allowing real-time monitoring of co-transcriptional RNA folding and structural dynamics at the molecular level. The exceptional photostability and narrow emission profile of XFD647-labeled nucleotides make them highly advantageous for multiplexed fluorescence imaging, enabling precise signal discrimination in complex biological samples.