Single
transitions C<-->U, G<-->A |
Transitions of type C<-->U, G<-->A between the third bases connect triplets within subsets SM1 - SM2 and SM4 - SM3
for example:
CCC<--->CCU, CCG<--->CCA. |
|
Fig. 13, c. Single transitions of type типа
C<-->U, G<-->A between the
third bases of triplets. |