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. 2016 Apr 28;3(1):e000082. doi: 10.1136/bmjgast-2016-000082

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

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A section of a pre-treatment colonic biopsy in the active stage (A) showing a well developed crypt abscess. <(B)> Note the PCNA/LI (PCNA, streptavidin peroxidase, (A) ×200, (B) ×400).