affinity chromatography of plasma samples on immobilized antibodies directed against the central portion of the somatostatin molecule ( residues 5 -- 9 and 11 ) removed approximately equal to 90 % of both endogenous sli and somatostatin added to plasma , but neither was removed by affinity chromatography on antibodies directed against the nh2-terminal region of somatostatin ( residues 1 -- 4 ) .
C2350610
immobilized antibodies
C0003241
antibodies