TABLE 1.

Estimation of the number of gained, lost and/or fixed genes per million years (My) as well as total and fixed number of substitutions on internal branches (int. b.) or terminal branches (ter. b.) for Prochlorococcus (Pro) HL and Synechococcus (Syn) SC 5.1.

Rate (per My)		Pro HL	Pro HL	Syn SC 5.1	Syn SC 5.1
		int. b.	ter. b.	int. b.	ter. b.
Gene gain	Value	1.45	4.5	0.72	4.62
	SE	0.08	0.52	0.12	0.68
	Adj. R2	0.95	0.83	0.46	0.50
	p-value	<10–5	<10–5	<10–5	<10–5
Gene loss	Value	0.87	3.72	1.68	1.8
	SE	0.26	0.44	0.16	0.22
	Adj. R2	0.41	0.82	0.73	0.60
	p-value	4.7 × 10–3	<10–5	<10–5	<10–5
Specific gene fixation	Value	0.39	–	0.16	–
	SE	0.03	–	0.06	–
	Adj. R2	0.9	–	0.11	–
	p-value	<10–5	–	0.01	–
Amino acid substitutions	Value	515.51	312.97	117.8	96.54
	SE	17.2	9.11	3.64	1.86
	Adj. R2	0.98	0.99	0.96	0.98
	p-value	<10–5	<10–5	<10–5	<10–5
Specific amino acid fixation	Value	78.1	–	18.41	–
	SE	5.44	–	0.83	–
	Adj. R2	0.93	–	0.92	–
	p-value	<10–5	–	<10–5	–

SE, standard error; adj. R², adjusted R².