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Thiazole Red Homodimer (TOTO®-3), 1 mM in DMSO

Thiazole red homodimer (TRhD), also known as TOTO®-3, is a cell-impermeant, high-affinity, far-red fluorogenic nucleic acid stain.

Product Attributes

Cellular localization

Nucleus & cytoplasm

Assay type/options

No-wash staining, Real-time imaging

Cell permeability

Membrane impermeant

Apoptosis/viability marker

Dead cell stain




642/660 nm (with DNA)

Note: Due to operating restrictions related to our COVID-19 response, primary antibody conjugates of R-PE, APC, PerCP, HRP, or AP are temporarily unavailable. All other antibody options are still available. We apologize for the inconvenience. Please see our easy-to-use Mix-n-Stain™ Antibody Labeling Kits for labeling antibodies with R-PE, APC, tandem dyes, and enzymes.
Catalog #
200 uL
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Product Description

Thiazole red homodimer (TRhD), also known as TOTO®-3, is a cell-impermeant, high-affinity nucleic acid stain based upon a symmetric cyanine dye dimer. The dye is essentially nonfluorescent in the absence of nucleic acids, but exhibits bright far-red fluorescence when bound to nucleic acids. TRhD is also used as a nuclear counterstain and dead cell indicator.

  • λExEm (with DNA): 642/660 nm
  • Blue solution
  • Store at 4°C and protect from light
  • C53H62I4N6S2
  • MW: 1354.85



TOTO is a registered trademark of Thermo Fisher Scientific.

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