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TLR2 expression is minimally detectable in IECs and remains unchanged in active IBD. (A) Normal, nondiseased mucosa. (C) UC, inactive. (B and D) CD, active colon involved. (Olympus IX70; original magnification, ×40; standardized exposure time, 1.039 s; full image area, gain 16; gamma adjust, 1.20; noise filter, no background subtraction.)
