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The cover picture shows examples of metal complexes with photoactivated biological activity, as symbolized by the lightning in the background. This includes liberation of small‐molecule messengers, such as carbon monoxide, nitric oxide, and neuroactive amines from the metal coordination sphere, as well as light‐triggered oxidative or covalent modification of DNA. More examples are presented in the Microreview by U. Schatzschneider on p. 1451 ff.
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Ulrich Schatzschneider (2010) studied this question.
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