title: Reply to Comment on 'Diffusion of water and sodium counter-ions in nanopores of β-lactoglobulin crystal: a molecular simulation study'.
abstract: The analysis in Hu and Jiang's Comment to our paper cannot reveal long-time diffusion, and incorrectly led the authors to conclude that the diffusion in beta-lactoglobuline is anomalous. In this context, the limitations of applying a mean-square displacement analysis to short, heterogeneous pore channels are discussed. A more appropriate approach based on first-passage time analysis is illustrated by a detailed analysis of water motion in a natural membrane protein channel. The partitioning and the motion of water molecules between core and surface hydration layers is discussed. Finally, the calculation of the water density profile is commented upon.
authors.affiliation: DelftChemTech, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
authors.forename: Kourosh
authors.initials: K
authors.lastname: Malek
authors.forename: Marc-Olivier
authors.initials: MO
authors.lastname: Coppens