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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2009 Oct 29;21(3):323–337. doi: 10.1016/j.jasms.2009.10.013

Figure 11.

Figure 11

Heterogeneity of protein-polymer conjugates exemplified by ESI MS of mono-PEGylated ubiquitin (A) and mono-PEGylated IFN (B). The average molecular weights of the PEG chains are 5 kDa (ubiquitin) and 20 kDa (IFN). Insets show mass spectra of unconjugated proteins.