Binding of FITC-conjugated X-2 to wood samples. Pine and birch sections stained with either FITC-conjugated G-4 (A-D) (negative control) or with FITC-conjugated X-2 (E-L). Sections were either untreated (A-H) or delignified (I-L) prior to staining. Pink arrows show signals in untreated samples. Note that A, C, E, G, I and K are from transverse sections and B, D, F, H, J and L are from longitudinal sections. Pine sections in A and E show both early- (to the left) and latewood (to the right). Scale bar = 50 μm.