Binding of GFP-gp16 to Lactobacillus cells. Recombinant proteins J-1 GFP-gp16 and PL-1 GFP-gp16 were incubated with Lactobacillus casei subsp. casei ATCC 27139 (a-b), L. paracasei subsp. paracasei ATCC 27092 (c-d), Lactobacillus acidophilus (e-f), and L. casei subsp. casei ATCC 27139 in the presence of l-rhamnose (g-h) or glucose (i-j). Cells were visualized by phase-contrast microscopy (left image) and fluorescence microscopy (right image). Magnification, 1,000×.