Role of rFBA in adhesion of M. hyopneumoniae to swine tracheal epithelial cells (STEC). Blue indicates STEC nuclei. Orange indicates A rFBA adhering to STEC membranes, and B BSA (negative control) adhering to STEC membranes. The left panel means protein adhered to the STEC membranes. The protein was labelled with tetraethyl rhodamine isothiocyanate (TRITC). The middle panel means cell nuclei of STEC stained with 6-diamidino-2-phenylindole (DAPI). The right panel means the merge of the left and middle panel. The white line indicates the scale.