Table 1. The fictitious regularized genetic code.

Codon	aa	Codon	aa	Codon	aa	Codon	aa
TTT	A	CTT	E	ATT	I	GTT	M
TTC	A	CTC	E	ATC	I	GTC	M
TTA	A	CTA	E	ATA	I	GTA	M
TTG	A	CTG	E	ATG	I	GTG	M
TCT	B	CCT	F	ACT	J	GCT	N
TCC	B	CCC	F	ACC	J	GCC	N
TCA	B	CCA	F	ACA	J	GCA	N
TCG	B	CCG	F	ACG	J	GCG	N
TAT	C	CAT	G	AAT	K	GAT	O
TAC	C	CAC	G	AAC	K	GAC	O
TAA	C	CAA	G	AAA	K	GAA	O
TAG	C	CAG	G	AAG	K	GAG	O
TGT	D	CGT	H	AGT	L	GGT	P
TGC	D	CGC	H	AGC	L	GGC	P
TGA	D	CGA	H	AGA	L	GGA	P
TGG	D	CGG	H	AGG	L	GGG	P

Note that the regularized genetic code encodes 16 fictitious amino acids, A–P, with no stop codons. Substitutions at the third codon position are always synonymous, while substitutions at the first and second positions are always nonsynonymous.