Abstract
A quantitative morphometric study of immunoglobulin-containing plasma cells in rectal biopsies from 9 patients with ulcerative colitis and 3 patients with the irritable colon syndrome was presented. Fixation of the biopsy specimens with formol-sublimate, a mercuric fixative, resulted in better staining with the immunoperoxidase method and, by comparison with formol saline, higher cell counts were always obtained.