Predominantly fucosylates the innermost N-acetyl glucosamine (GlcNAc) residue in biantennary N-glycan acceptors. Postulated to generate core alpha(1->3)-fucose epitope within the chitobiose unit of biantennary N-glycans, providing for a recognition signal to reorient aberrantly folded glycoproteins for degradation (By similarity). Involved in biosynthesis of Lewis X-carrying biantennary N-glycans that regulate neuron stem cell self-renewal during brain development (PubMed:23986452). Protein modification; protein glycosylation. Widely expressed, with a higher expression in liver and thymus. Expressed by Lewis X-positive neural precursor cells in the ventricular and subventricular zones of 15.5 dpc embryonic brain. Belongs to the glycosyltransferase 10 family. Fucosyltransferase 10