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Table 4 Synonymous and nonsynonymous nucleotide substitution in pairwise comparisons of sequences from radish and Arabidopsis.

From: Genes encoding pentatricopeptide repeat (PPR) proteins are not conserved in location in plant genomes and may be subject to diversifying selection

Genes1

Synonymous nucleotide substitutions (Ks)

Nonsynonymous nucleotide substitutions (Ka)

Ka:Ks2

Rfo-g24

43

84

1.95

Rfo-g27

48

76

1.58

g24-g27

43

93

2.16

g19-At1g63640

167

123

0.74

g21-At1g63650

111

107

0.96

g23-At1g63680

218

88

0.40

  1. 1 Rfo, g19, g21, g23, g24 and g27 are all genes from radish, while those starting "At" are genes from Arabidopsis. The entire protein coding regions were analysed.
  2. 2 Where Ka:Ks = 1 there is no selective pressure acting on the sequence; where Ka:Ks < 1 purifying selection, with a minimization of mutations acts on the sequence; where Ka:Ks > 1 diversifying selection favoring amino acid change acts on the sequence.