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. Author manuscript; available in PMC: 2013 Jun 15.
Published in final edited form as: Bioorg Med Chem Lett. 2012 Apr 30;22(12):3931–3934. doi: 10.1016/j.bmcl.2012.04.110

Figure 2.

Figure 2

Mass spectra of (A) the pre-formulated Cy5-streptavidin:biotin-PEG12-CTT54 complex and (B) Cy5-streptavidin alone. The mass difference between the pre-formulated complex and Cy5-streptavidin is 3.772 Kd; three Biotin-PEG12-CTT54 molecules and two displaced water molecules.