LeSUT1 immunolocalization. SUT1 was immunolocalized in different transgenic tobacco lines using antibody against StSUT1  and detected using a secondary antibody conjugated to FITC. SUT1 localized to sieve element in wild type tobacco and tomato; but appears present in companion cells of transgenic plants. A) Wild type tobacco, B) Wild type tomato, C) RolC-LeSUT1-GFP, D) RolC-LeSUT1-GFP-3'-UTR. CC, companion cell; SE, sieve element; sp, sieve plate, nucleus. Bar indicates 10 μm.