Two-Fold Degenerate Sites

The genetic code for phenylalanine (Phe) is UUYUUU or UUC , with either pYrimidine (Y) in the third position.
The genetic code for glutamine (Glu) is GARGAA or GAG , with either puRine (R) in the third position.


Figure © 2000 by Griffiths et al. ; text © 2009 by Steven M. Carr