Counterion-mediated protein adsorption into polyelectrolyte brushes Su-zhen He, Holger Merlitz, Jens-Uwe Sommer and Chen-Xu Wu Eur. Phys. J. E, 38 9 (2015) 101 Published online: 21 September 2015 DOI: 10.1140/epje/i2015-15101-9