Table 2. The mitogenome composition of A. americanus and Bufotes pewzowi.

Region	Size (bp)		A+T content		C+G content		AT-skew		CG-skew
	A. americanus	B. pewzowi	A. americanus	B. pewzowi	A. americanus	B. pewzowi	A. americanus	B. pewzowi	A. americanus	B. pewzowi
Whole Genome	17,328	17,551	62.4	59.1	37.6	40.9	−0.038	−0.002	−0.248	−0.271
PCGs	11,290	11,290	61.9	58.6	38	41.5	−0.111	−0.085	−0.256	−0.272
rRNA	2,536	2,543	60.7	58.8	39.4	41.2	0.117	0.149	−0.086	−0.103
tRNA	1,534	1,535	58.9	59.5	41.2	40.4	0.039	0.028	0.014	0.04
CRs	1,916	2,129	70.3	63	29.7	37.1	−0.030	0.006	−0.205	−0.294