There are ten codons that code for phenylalanine in eukaryotes (which include animals and plants). These codons are numbered from left to right as follows: Cytidine(cyt), Adenine(a), Thymine(t), Uracil(u), Guanine(g), AUG(a), CAG(a), AGG(a), and TAA(a). These codons are found in many important genes that code for proteins in living organisms.