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High-power (×20) views of representative sections from a biopsy of human colon, incubated with the HC domain from TeNT as a negative control, with native SLPs from strain 630 (SLP-630), and with purified recombinant low-MW SLP (pET-Low) or high-MW SLP (pET-High). Positive binding is indicated by the brown color following immune detection with antisera specific for native SLPs (TeNT and 630) or individual subunits and HRP-coupled anti-Ig.
