The mammalian mitochondrial genetic code and their tRNAs

22 tRNA genes
of mammalian mitochondrial genome

Code	6 hydrogen bonds	5 hydrogen bonds	5 hydrogen bonds	4 hydrogen bonds
000	tRNA^Pro CC	tRNA^Ser₁ UC	tRNA ^Leu₁ CU	tRNA^Phe UU (C/U)
001	tRNA^Pro CC	tRNA^Ser₁ UC	tRNA ^Leu₁ CU	tRNA^Leu₂ UU (A/G)
100	tRNA^Ala GC	tRNA^Thr AC	tRNA^Val GU	tRNA^Ile AU (C/U)
101	tRNA^Ala GC	tRNA^Thr AC	tRNA^Val GU	tRNA^Met AU (A/G)
010	tRNA ^Arg CG	tRNA^Cys UG (C/U)	tRNA^His CA (C/U)	tRNA^Tyr UA (C/U)
011	tRNA ^Arg CG	tRNA^Trp UG (A/G)	tRNA^Gln CA (A/G)	Stop UA (A/G)
110	tRNA^Gly GG	tRNA^Ser₂ AG (C/U)	tRNA^Asp GA (C/U)	tRNA^Asn AA (C/U)
111	tRNA^Gly GG	Stop AG (A/G)	tRNA^Glu GA (A/G)	tRNA^Lys AA (A/G)

Table 2. There are 8 blocks for family codons and 14 blocks for non-family codons