7.2 Codon-anticodon recognition involves wobbling UUU UCU UUC UCC UAC JGC UUA UCA UGA UUG UCG UAG UGG CCU CAU CGU CUC CCC CGC Figure 7.3 Third bases CAA CGA CUG CCG CAG CGG have the least influence A儿U ACU 凸凸 AGU AUC ACC AAC AGC on codon meanings AUA ACA AAA AGA AUG AGG Boxes indicate groups GUU GCU GAU GGU GUC GCC GGC GUA GCA of codons within which GGA GUG GCG GAG GGG third-base degeneracy Third base relation ship Third bases Number with same of codons ensures that the meaning meaning is the same third base irrelev ant U,C, A,G 32 purines differ rom pyrimidines Aor G 10 unique U CA definitions n 消当Figure 7.3 Third bases have the least influence on codon meanings. Boxes indicate groups of codons within which third-base degeneracy ensures that the meaning is the same. 7.2 Codon-anticodon recognition involves wobbling