TABLE 2.

Description of C to U transitions in ORF1ab of SARS-CoV-2: before (ORF1a) and after (ORF1b) the ribosome slippage sequence.

	ORF1a		ORF1b
	Synonymous	Non-synonymous	Synonymous	Non-synonymous
Number of sites with C to U mutation	32	51	17	13
Number of available sites	630	1700	403	1011
Rate of mutations, substitution per site	0.050794	0.03000	0.042184	0.012859

Significant changes between rates of synonymous and non-synonymous mutations are shown by bold font, significant changes in rate of the same type of mutation between ORFs are shown in underlined font.