Table 3.

Gene products encoded by the E. coli K-12 chromosome

Gene product type	Characterized	Putative assignment	Total (%)
Enzyme	1,042	578	1,620 (34.2)
Transport	382	364	746 (15.8)
Regulator	238	167	405 (8.5)
Membrane	53	158	211 (4.4)
Factor	117	33	150 (3.2)
Structure	92	35	127 (2.7)
Carrier	35	25	60 (1.3)
Extrachromosomal*	288		288 (6.1)
Phenotype			98 (2.1)
RNA	116		116 (2.4)
Leader	12		12 (0.3)
ORF			899 (19.0)
Total	2,375	1,360	4,732 (100.0)

Proteins are represented as modules. ^*Extrachromosomal origin.