Representation of carboxybetaine methacrylate (CBMA) and sulfobetaine methacrylate (SBMA) polymer brushes prepared on gold substrates via atom transfer radical polymerization. Figure adapted with permission from Langmuir, 2006, 22, Zhang, Z.; Chao, T.; Chen, S.; Jiang, S. “Superlow fouling sulfobetaine and carboxybetaine polymers on glass slides,” pages 10072–10077. Copyright 2006 American Chemical Society.