Table 1.

Absolute and relative numbers of envelope related genes in four cyanobacteria. PBR, LBR, EBR, OMP, and OU represent peptidoglycan biosynthesis-related, lipopolysaccharide biosynthesis-related, exopolysaccharide biosynthesis-related, outer membrane proteins coding, and other unknown genes, respectively. The data in the brackets were the percentage of each group within the total envelope-related genes.

Species	Total	PBR	LBR	EBR	OMP	OU
Prochlorococcus marinus MED4	100	29 (29.0%)	40 (40.0%)	14 (15.0%)	16 (15.0%)	2 (2.0%)
Synechocystis sp. PCC 6803	186	37 (19.9%)	73 (39.2%)	28 (15.1%)	40 (21.5%)	8 (4.3%)
Trichodesmium erythraeum IMS101	266	47 (17.7%)	90 (33.1%)	48 (18. 0%)	63 (23.7%)	18 (6.8%)
Anabaena sp. PCC 7120	294	48 (16.3%)	113 (38.4%)	61 (20.7%)	60 (20.4%)	12 (4.1%)