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机译:Evolutionary switches between two serine codon sets are driven by selection
Natl Lib Med, Natl Ctr Biotechnol Informat, NIH, Bethesda, MD 20894 USA;
Univ Iowa, Biomed Engn Dept, Iowa City, IA 52242 USA;
tandem nucleotide substitutions; serine codon sets; purifying selection; positive selection; homoplasy;