we now describe a method for rapid and reliable separation of precursor and rtf-transformed receptor forms , which takes advantage of a difference in isoelectric point between the two : the more acidic precursor ( isoelectric point , 6.2 ) is still retained by deae-cellulose under conditions ( 0.12 m kcl , ph 8.3 ) which produce release from cellulose of the less acidic transformed form ( isoelectric point , 6.6 to 6.8 ) .
C0011050
deae-cellulose
C0007648
cellulose