( b ) reducing the incubation ph to 2 , ( c ) incubating the mixture at 4 degrees c , ( d ) pretreating the ileal extract at 56 degrees c for 30 min , ( e ) incubating the reaction in sodium edta but not calcium edta , ( f ) incubating gastric juice- ( 57 ) cob ( 12 ) with an extract of jejunal mucosa .
C0013618
edta
C0006692
calcium