; MET4 matrix, from Gonze et al. (2005). Bioinformatics 21, 3490-500.
A |   7   9   0   0  16   0   1   0   0  11   6   9   6   1   8
C |   5   1   4  16   0  15   0   0   0   3   5   5   0   2   0
G |   4   4   1   0   0   0  15   0  16   0   3   0   0   2   0
T |   0   2  11   0   0   1   0  16   0   2   2   2  10  11   8
//
; MET31 matrix, from Gonze et al. (2005). Bioinformatics 21, 3490-500.
A |   3   6   9   6  14  18  16  18   2   0   0   0   1   3   8
C |   8   3   3   2   3   0   1   0  13   2   0   1   0   3   6
G |   4   3   4   8   0   0   1   0   2   0  17   1  17  11   1
T |   3   6   2   2   1   0   0   0   1  16   1  16   0   1   3
//
; PHO4 matrix, from Gonze et al. (2005). Bioinformatics 21, 3490-500.
A |   0   4   4   1   1  21   0   0   0   0   2   2   6   1   7
C |   2   7  12   6  20   0  20   0   1   0   5   5   8   4   6
G |   5   1   2  11   0   0   0  21   0  15   8   7   2  11   2
T |  14   9   3   3   0   0   1   0  20   6   6   7   5   5   6