%0 Journal Article %T Mutation-Selection Models of Codon Substitution and Their Use to Estimate Selective Strengths on Codon Usage %A Yang, Ziheng %A Nielsen, Rasmus %J Molecular Biology and Evolution %V 25 %N 3 %P 568-579 %@ 0737-4038 %D 2008-01-03 %I Oxford University Press %~ DeepDyve