NucSpot Nuclear Stains
Cell membrane-impermeant, nuclear-specific counterstains. Suitable for fixed cells or staining dead cells in live cultures. Available in a variety of colors from green to near-infrared (near-IR).
HeLa cells stained with NucSpot® Nuclear Stains
Methanol-fixed HeLa stained with NucSpot® 470.
Place your order directly with the manufacturer.
NucSpot® Nuclear Stains are cell membrane-impermeant, nuclear-specific counterstains available in a variety of colors from green to near-infrared (near-IR).
- Nuclear-specific counterstains for fixed cells
- Selectively stains dead cells in live culture
- No wash required
- Options for cell cycle profiling by flow cytometry in fixed/permeabilized cells
- Color options for FITC, Cy®3, PE, Texas Red®, Cy®5, APC, Cy®5.5, and Cy®7 channels
NucSpot® Stains have minimal fluorescence until they bind to DNA and can be used for no-wash nuclear staining. Unlike other nucleic acid dyes such as propidium iodide (PI), TOTO®, TO-PRO®, and similar dyes that stain both the nucleus and cytoplasm, NucSpot® Nuclear Stains selectively stain the nucleus in fixed and permeabilized cells without the need for RNase treatment.
NucSpot® Nuclear Stains also can be used for selective staining of dead cells in unfixed cell cultures for analysis by flow cytometry or fluorescence imaging. Several of the dyes can be continuously incubated with cells for multi-day imaging. NucSpot® 470 and NucSpot® Far-Red can be used for DNA content analysis of cell cycle by flow cytometry in fixed and permeabilized cells without requiring RNase treatment, unlike propidium iodide.
Find the right dye for your application
NucSpot® 470 has green fluorescence that can be imaged using standard settings for FITC. With an excitation maximum around 460 nm, it is an excellent match for instruments with blue LED excitation sources as well. It can be used for DNA content analysis of cell cycle by flow cytometry in fixed and permeabilized cells without requiring RNase treatment, unlike propidium iodide. NucSpot® 470 can also be used for nuclear staining of dead or permeabilized yeast. In gram-negative bacteria it selectively stains dead cells, while in gram-positive bacteria it may stain live cells.
NucSpot® 555/570 and NucSpot® 568/580 have orange and visible red fluorescence, respectively, and are nuclear-specific alternatives to PI and similar dyes.
NucSpot® 594/615 has deep red fluorescence for the Texas Red® channel.
NucSpot® 650/665 has far-red fluorescence with superior nuclear specificity compared to first-generation far-red nuclear stains such as RedDot™2 and Draq7™.
NucSpot® 680/700 and NucSpot® 750/780 are spectrally unique DNA stains for far-red and near-IR detection.
TOTO and TO-PRO are registered trademarks of Thermo Fisher Scientific; Draq is a trademark of BioStatus Ltd; CY is a registered trademark of Cytiva.
