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. Author manuscript; available in PMC: 2009 Oct 3.
Published in final edited form as: Anal Chim Acta. 2008 Jun 5;627(1):117–128. doi: 10.1016/j.aca.2008.05.074

Figure 3.

Figure 3

The high-resolution structure of bovine erythrocytes ubiquitin (PDB ID: 1ARR) [69] shows that R42, R72, and R74 are brought close together by the protein fold, whereas R54 remains isolated and out of crosslinking range.