Assertion: ngf's activity | /r/RelatedTo | neutral or acidic protein
Facets:
Source sentences:
text: Although the elution characteristics on the first two ion-exchange columns suggested that the biological activity was associated with a neutral or acidic protein (specifically one with an isoelectric point of less than 7.4), the requirement of high salt concentrations to elute the active fraction from the third carboxymethyl (CM)-cellulose column at acid pH suggested a basic protein.