10  responses in all to  the section  thickness  question for immunostaining of  paraffin sections , 2 labs cut  at  3u; 1 lab cuts at 3-4u; 1 lab  cuts at 4u; 4 labs  cut at 5u; and  2 labs   depend  on  what antigen is  being looked  for, so  as  ever in  the  wonderful  world  of histology,   you  pays your  money  and  makes  your  choice!!.

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