PAP pens

From:Mark Hammond <>

Dear all (esp in the UK),

I am interested in other peoples' methods of "ringing" sections for
immunocytochemistry.  Since the demise of the Dako PAP pens, we are
experiencing problems with other such pens, particularly when the nibs
get wet (NB: the slides in question are frozen sections stored at -70oC
and are difficult to mark).  Any info or remarks would be gladly


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