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

Thiazole orange homodimer (TOhD), also known as TOTO®-1, is a cell-impermeant, high-affinity, fluorogenic green 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




520/514 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 orange homodimer (TOhD), also known as TOTO®-1, 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 shows bright green fluorescence when bound to nucleic acids.

  • λExEm (with DNA): 520/514 nm
  • Orange solution
  • Store at 4°C and protect from light
  • C49H58I4N6S2
  • MW: 1303

TOTO is a registered trademark of Thermo Fisher Scientific.



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