an arylamine sulfotransferase ( pst-m ) from human brain cortex that is involved in the formation of o-sulfate esters of monoamines has been purified 272-fold by ammonium sulfate fractionation , gel filtration , deae-cellulose ion-exchange chromatography , chromatofocussing , and hydroxyapatite chromatography .
C0038720
sulfate
C0002620
ammonium sulfate