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. 2009 Aug 4;8(10):2266–2284. doi: 10.1074/mcp.M900238-MCP200

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© 2009 by The American Society for Biochemistry and Molecular Biology, Inc.

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Fig. 10. — ETD tandem mass spectra of two chromatographically resolved diacetylated-dimethylated structural isomers of histone H4 that differ by a shift of an acetyl group by three amino acids. a, the Nα-acK8acK12acK20me2 modified form of histone H4 showing full sequence coverage. The ions labeled in bold text differ from the spectrum below it. b, the Nα-acK5acK12acK20me2 modified form of histone H4 fully sequenced by ETD. The change from K8 acetylation to K5 acetylation is indicated by the bold ions. A.U., arbitrary units.