Corrections and Clarifications


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Science  21 Feb 1992:
Vol. 255, Issue 5047, pp. 904
DOI: 10.1126/science.255.5047.904-e


In the Research News article "Is nitric oxide the `retrograde messenger'?" by Marcia Barinaga (29 Nov., p. 1296), in the illustration on page 1297, the word "citroline" should have read "citrulline".

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