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===Xeración da GlcNH<sub>2</sub>===
DueDebido toa theque a actividade de N-deacetylasedesacetilase e andde N-sulfotransferase beingas carriedleva outa bycabo theo samemesmo enzymeencima, a N-sulfationsulfatación isestá normallynormalmente tightlycombinada coupled tocoa N-desulfationdesulfatación. GlcNH<sub>2</sub>Na residuesheparina resultinge fromnalgunhas apparentespecies uncouplingde ofheparán thesulfato twoatopáronse activitiesresiduos havede beenGlcNH<sub>2</sub> foundorixinados inpolo heparinaparente anddesaxuste someentre speciesas ofdúas HSactividades.<ref>{{cite journal | author=Toida, T. | title=Structural differences and the presence of unsubstituted amino groups in heparan sulphates from different tissues and species | journal=Biochem. J. | date=1 January 1997| volume=322(Pt2) | pages=499–506 | pmid=9065769 | issue=Pt 2 | pmc=1218218 | display-authors=1 | last2=Yoshida | first2=H | last3=Toyoda | first3=H | last4=Koshiishi | first4=I | last5=Imanari | first5=T | last6=Hileman | first6=RE | last7=Fromm | first7=JR | last8=Linhardt | first8=RJ }}</ref>
===Epimerización e sulfatación 2-O===
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