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Effects of guanosine 5′-O-(3-thiotriphosphate) (GTPγS) and guanosine 5′-o-(2-thiodiphosphate) (GDPβS), on intestinal Na+, K+-ATPase activity from (A) 20- and (B) 60-day old rats. Columns represent means of four to five experiments per group; vertical lines show s.e.mean. *Significantly different from corresponding control values (P<0.05; Newman-Keuls test).
