Shreffler: Hoerscht Counterstaining

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  • Frosted glass slides, pre-cleaned (Cat. 12-550-343; Fisherbrand)
  • Cytospin machine
  • Microscope
  • Coplin jar


  • Methanol (Cat. 494437-1L; Sigma-Aldrich)
  • Hoescht dye aliquots acquired from Mempel lab (unsure if Hoechst 33258 or Hoechst 33342)


  1. Cytospin cells onto a frosted slide, pre-cleaned (600 rpm, 5 min, approx. 500 µl cell suspension used).
  2. Dry for 15 minutes at RT.
  3. Place in 100% methanol for 1 min.
  4. Remove and dry for 5 min at RT (keep in dark).
  5. Meanwhile, mix Hoescht dye by adding 5 µl of aliquoted stock to 50 ml of diH20 in a Coplin jar.
  6. Place slide in the in the Hoescht staining solution in the Coplin jar for 1 min.
  7. Wash in diH20 for 5 min without agitation.
  8. Dry at RT in the dark for at least 15 min.
  9. Analyze by microscopy.