Table 2.

Codon usage of the protein-coding genes in C. urodeta mtgenome.

Amino acid	Codon	No.	%	Amino acid	Codon	No.	%
Phe	UUU	80	2.10	Stop	UAA	6	0.21
	UUC	158	4.15		UAG	1	0.03
Leu	UUA	94	2.47	His	CAU	30	0.79
	UUG	12	0.32		CAC	76	2.00
	CUU	137	3.60	Gln	CAA	93	2.44
	CUC	126	3.31		CAG	7	0.18
	CUA	241	6.33	Asn	AAU	42	1.10
	CUG	33	0.87		AAC	78	2.05
Ile	AUU	144	3.78	Lys	AAA	73	1.92
	AUC	130	3.41		AAG	4	0.11
Met	AUA	100	2.63	Asp	GAU	31	0.81
	AUG	63	1.65		GAC	49	1.29
Val	GUU	58	1.52	Glu	GAA	82	2.15
	GUC	56	1.47		GAG	13	0.34
	GUA	96	2.52	Cys	UGU	13	0.34
	GUG	13	0.34		UGC	14	0.37
Ser	UCU	39	1.02	Trp	UGA	104	2.74
	UCC	74	1.94		UGG	13	0.34
	UCA	68	1.79	Arg	CGU	12	0.32
	UCG	7	0.18		CGC	10	0.26
Pro	CCU	48	1.26		CGA	47	1.23
	CCC	88	2.31		CGG	9	0.24
	CCA	75	1.97	Ser	AGU	4	0.11
	CCG	7	0.18		AGC	46	1.21
Thr	ACU	46	1.21		AGA	***	—
	ACC	115	3.02		AGG	***	—
	ACA	129	3.39	Gly	GGU	53	1.39
	ACG	13	0.34		GGC	74	1.94
Ala	GCU	84	2.21		GGA	88	2.31
	GCC	128	3.36		GGG	27	0.71
	GCA	130	3.41		NNAa	1426	37.49
	GCG	7	0.18		NNTa	860	22.58
Tyr	UAU	39	1.02		NNCa	1292	33.92
	UAC	70	1.84		NNGa	229	6.01

A total of 3807 codons were analyzed excluding the incomplete stop codons.

^aAmount and percentages of codons with the 3rd site nucleotide composition of A, T, C, G.

*** the stop code AGA and/or AGG (instead of Ser) was not detected.