FIG. 4.
Low (×10)- and high (×20)-power views of representative sections from mouse colon incubated with the HC domain from TeNT as a negative control, with native SLPs from strain 630 (SLP-630), or with purified recombinant SlpA precursor (pNZ-1e4H). Positive binding is indicated by the brown color following immune detection with anti-SLP antiserum and HRP-coupled anti-Ig.