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. Author manuscript; available in PMC: 2014 Nov 15.
Published in final edited form as: Int J Mass Spectrom. 2013 May 31;354-356:181–187. doi: 10.1016/j.ijms.2013.05.022

Scheme 4.

Scheme 4

Proposed rearrangement mechanism of acyl arginine when the acyl group contains at least one α-hydrogen. Path 3 involves the rearrangement of acyl-arginine to regenerate unmodified arginine, while the acyl group is lost as a ketene.