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Blood clearance. Blood samples were collected by tail nicking at 2, 15, 33, 60 and 200 minutes post injection of contrast agent and quantitated by gamma counting. Clearance from the blood is rapid with ∼ 97% of the injected agent cleared out from the blood stream after 2 minutes; 0.5% of injected dose remaining after 30 minutes and undetectable levels in the blood after 1 hour. Error bars reflect standard error.
