Binding of CBMs to different wood sections. Binding of wt CBM4-2 (D-F), X-2 (G-I), X-6 (J-L) and X-13 (M-O) to birch, pine and poplar wood sections. Negative control staining of wood samples with mouse anti-His antibody and FITC-conjugated anti-mouse IgG is shown in (A-C). All modules bind to border pit chambers in earlywood and to the latewood lumen wall in pine (blue arrows). Pink arrows show staining of G-layers with wt CBM4-2 and X-6 in birch and poplar cell walls (D, F, J, L), a staining that was not observed with X-2 and X-13 (G, I, M, O; white arrowheads). Note all images are from transverse sections and images of pine sections include examples of both early- (above) and latewood (below). Scale bar = 50 μm.