title: Young proteins experience more variable selection pressures than old proteins.
authors.affiliation: Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: Anchal
authors.initials: A
authors.lastname: Vishnoi
authors.forename: Sergey
authors.initials: S
authors.lastname: Kryazhimskiy
authors.forename: Georgii A
authors.initials: GA
authors.lastname: Bazykin
authors.forename: Sridhar
authors.initials: S
authors.lastname: Hannenhalli
authors.forename: Joshua B
authors.initials: JB
authors.lastname: Plotkin