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. 1997 Jul 22;94(15):7712–7718. doi: 10.1073/pnas.94.15.7712

Table 4.

Distribution of replacement substitutions over the codons

Distribution
Changes 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
Codons 174 63 21 27 9 8 6 5 3 4 2 1 1 1 1 3

The bottom row shows the number of codons that have changed as many times as the number above it.