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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Anal Chem. 2011 Apr 5;83(9):3252–3255. doi: 10.1021/ac200439k

Figure 3.

Figure 3

(a) Positive ion nESI mass spectrum of a mixture of amino acids present in a solution of precipitated plasma, and (b) negative ion mass spectrum after charge inversion using anions generated from nESI of PAMAM generation 3.5.