Table 3

Frequency (Columns A-C), Dufton's (1997) size/complexity score [29] (Columns D-F) and Trifonov (2004) chronology ranking [30] (Columns G-I) of amino acids of degeneracy greater than one that have major codons. (In [30] there is no ranking for the two-fold part of Ser (Ser2), but its initiation was placed somewhere between Thr and Ile.)
A
 B
 C
 D
 E
 F
 G
 H
 I
Amino acid
 Group
 Frequency per 10,000 codons
 Amino acid
 Group
 Size/complexity score
 Amino acid
 Group
 Chronology ranking
Leu4
 A
 786
 Gly
 A
 1
 Gly
 A
 3.5
Ala
 A
 704
 Ala
 A
 4.76
 Ala
 A
 4
Gly
 A
 663
 Val
 B
 12.28
 Val
 B
 6
Pro
 A
 628
 Ile
 A
 16.04
 Asp
 B
 6.3
Val
 B
 598
 Leu4
 A
 16.04
 Ser4
 A
 7.3
Thr
 A
 526
 Ser2
 B
 17.86
 Pro
 A
 7.6
Ser4
 A
 500
 Ser4
 A
 17.86
 Leu4
 A
 9.4
Asp
 B
 479
 Thr
 A
 21.62
 Thr
 A
 9.9
Gln
 A
 477
 Pro
 A
 31.8
 Ser2
 B
Ile
 A
 433
 Asp
 B
 32.72
 Ile
 A
 11
Phe
 B
 365
 Asn
 B
 33.72
 Asn
 B
 11.3
Asn
 B
 362
 Gln
 A
 37.48
 Gln
 A
 11.4
Ser2
 B
 326
 Phe
 B
 44
 His
 B
 13.3
Tyr
 B
 266
 Tyr
 B
 57
 Phe
 B
 13.8
His
 B
 261
 Cys
 B
 57.16
 Cys
 B
 14.2
Cys
 B
 227
 His
 B
 58.7
 Tyr
 B
 15.2

Kotlar and Lavner BMC Genomics 2006 7:67   doi:10.1186/1471-2164-7-67