Verified locator: Biochimica et Biophysica Acta717(3),414–421(27August1982), DOI10.1016/0304-4165(82)90282-3. Primary Abstract: gel chromatography on SephacrylS-200, removal of endogenous acceptors, differing solubility and sulfhydryl dependence. Original bylines O Habuchi and N Miyashita retained without guessing full identities.