WNT5A and FZD5 expression in lung tissue of M tuberculosis–infected patients. Sections from lung biopsies of M tuberculosis–infected patients were stained for the presence of FZD5 protein (left column) and WNT5A mRNA (right column) as described in “Materials and methods.” Arrows indicate a selection of FZD5 resp. WNT5A-positive cells. Inserts represent a 3-fold magnification of the areas with positive cells defined by white arrows. Bar = 100 μm.