Table 2.

Comparison of the T. ferrooxidans ATCC 23270 genome with those of E. coli K-12 and B. subtilis 168

	T. ferrooxidans	E. coli	B. subtilis
Genome size, Mb	2.7	4.7	4.2
DNA assembled, %	96	100	100
Total ORFs	2,712	4,289	4,083
Assigned ORFs	2,159	3,499	3,016
Asserted pathways	305	906	82
Missing assignments*	95	102	178
No sequences†	49	233	173

^*These ORFs cannot yet be assigned functions by using all the annotation tools in WIT. 

^† These represent known physiological functions for which no ORF can be assigned at present.