Corrections and Clarifications
In the report "Carbon monoxide: A putative neural messenger" by A. Verma et al. (15 Jan. 1993, p. 381), the first full sentence in column 3 on page 381 should have read, "Like NO, CO is a noxious gas that activates guanylyl cyclase (8), and it has been postulated that CO, derived from heme by the action of heme oxygenase, has physiological functions (9)." Reference 9 should have referred to an article by G. S. Marks et al. [Trends Pharmacol. Sci. 12, 185 (1991)], which was erroneously included in reference 8. References 9 through 24 should have been numbered 10 through 25.