When the sulfated oligosaccharides released from the sulfated fetuin after sequential digestion with proteinase and neuraminidase were subjected to a reaction sequence of hydrazin-olysis, deaminative cleavage and NaBH(4)reduction, the major product was co-eluted with [(3)H]Gal(6SO(4))beta1-4anhydromannitol in SAX-HPLC.