Complex sentence: Functional FUT2 fucosyltransferase transferes a fucose sugar to the end of the Histo-blood group ABO (H) precursor in gastrointestinal cells as well as saliva glands and this is thought to act as receptors for human norovirus.
Split into simpler sentences: Functional FUT2 fucosyltransferase transferes a fucose sugar to the end of the Histo-blood group ABO (H) precursor in gastrointestinal cells as well as saliva glands. The ABH antigen produced is thought to act as receptors for human norovirus.