title: Comment on "Resolving the mystery of the chain friction mechanism in polymer liquids".
abstract: A Comment on the Letter by Alexei P. Sokolov and Kenneth S. Schweizer, Phys Rev. Lett. 102, 248301 (2009). The authors of the Letter offer a Reply.
authors.forename: K L
authors.initials: KL
authors.lastname: Ngai
authors.forename: D J
authors.initials: DJ
authors.lastname: Plazek
authors.forename: C M
authors.initials: CM
authors.lastname: Roland