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Effects of RG-tannin on CTA-catalyzed ADP-ribosylation of Caco-2 cell membranes. CT-catalyzed ADP-ribosylation assays as described in Materials and Methods contained the indicated amounts of CTA and RG-tannin. Lane 1, no additions; lanes 2–5, 2.5 μg of CTA; lanes 3 and 6, 15 μg of RG-tannin; lanes 4 and 7, 10 μg of RG-tannin; and lanes 5 and 8, 5 μg of RG-tannin.
