TABLE 2.

Assessment of E. coli K-12 strain MG1655-specific genes detectable in strain Nissle 1917 core genome by E. coli Panorama DNA array hybridization

ORF functional category	No. of ORFs detected in E. coli strain:
	MG1655	Nissle 1917
Hypothetical, not experimentally classified, or unknown	1,634	1,415
Phage, transposon, or plasmid	87	55
Cell structure	182	163
Other	2,387	2,260
Total	4,290	3,893