RT Journal Article SR Electronic T1 The distribution of beneficial and fixed mutation fitness effects close to an optimum JF Genetics JO Genetics FD Genetics Society of America DO 10.1534/genetics.108.087122 A1 Martin, Guillaume A1 Lenormand, Thomas YR 2008 UL http://www.genetics.org/content/early/2008/05/27/genetics.108.087122.abstract AB