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Holmlin, R. E., Chen, X., Chapman, R. G., Takayama, S., & Whitesides, G. M. (2001). Zwitterionic SAMs that Resist Nonspecific Adsorption of Protein from Aqueous Buffer. Langmuir, 17(9), 2841–2850. doi:10.1021/la0015258 
10.1021/la0015258