TABLE 3.

Selection pressure on various gene categories

Virus and category	No.	Mean ω	SD	Mean SD	P
Cannes 8 virus
Known function	55	0.14	0.13	0.02	>0.08
Anonymous	48	0.18	0.15	0.02
Conserved	88	0.12	0.1	0.01	<5 × 10−5
Not conserved	15	0.35	0.18	0.05
Core	17	0.06	0.06	0.02	<5 × 10−4
Noncore	86	0.18	0.14	0.02
Bacterial HGT	18	0.19	0.15	0.03	>0.11
Nonbacterial HGT	85	0.15	0.14	0.01
Marseillevirus
Known function	64	0.13	0.11	0.01	>0.17
Anonymous	56	0.17	0.16	0.02
Conserved	104	0.12	0.1	0.01	<1 × 10−4
Not conserved	16	0.3	0.22	0.05
Core	17	0.08	0.07	0.02	<0.015
Noncore	103	0.16	0.14	0.01
Bacterial HGT	16	0.13	0.11	0.03	>0.65
Nonbacterial HGT	104	0.15	0.14	0.01