Colonic frozen sections (4 μm thick) were stained with anti-Ki67 (Abcam, Cambridge, MA, USA), rabbit anti-CHI3L1 (Affinity Bioreagent, Golden, CO), rat anti-F4/80 (Serotec, Raleigh, NC, USA), -CD4 (eBioscience, San Diego, CA, USA), -CD11b (BD Pharmingen, San Jose, CA, USA), or -cytokeratin 8, TROMA–1 (Developmental Studies Hybridoma Bank at the University of Iowa (Iowa City, IA) antibodies, as well as normal rabbit Ig using the avidin-biotin-complex system (Vector laboratories) as previously described [12 (link)].
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