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. 1998 Sep 1;95(18):10361–10366. doi: 10.1073/pnas.95.18.10361

Figure 10.

Figure 10

Possible mechanism for the photocleavage reaction. The initial step is hydrogen atom abstraction at the α-carbon by Py⨥, followed by the addition of O2 to form hydroperoxyl radical. The cleavage of the peptide backbone may then occur after mild hydrolysis.