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Table 1 Notation

From: Modeling compositional dynamics based on GC and purine contents of protein-coding sequences

Parameter Description
A Adenine content
T Thymine content
G Guanine content
C Cytosine content
GC Guanine-plus-cytosine content, GC = G + C
S Guanine-plus-cytosine content, S = G + C
R Purine (adenine-plus-guanine) content, R = A + G
A i Adenine content at codon position i, i = 1, 2, 3
T i Thymine content at codon position i, i = 1, 2, 3
G i Guanine content at codon position i, i = 1, 2, 3
C i Cytosine content at codon position i, i = 1, 2, 3
S i Guanine-plus-cytosine at codon position i, S i = G i + C i , i = 1, 2, 3
R i Purine content at codon position i, R i = A i + G i , i = 1, 2, 3