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Volume 60, no. 7, p. 2593, abstract, line 11: "radiolabeled either" should read "radiolabeled ether." Page 2594, column 1, line 13 from bottom: "KH(inf2)PO(inf4) (350 pmg/liter)" should read "KH(inf2)PO(inf4) (350 mg/liter)."
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