Table 4.

Number of Genes and Pseudogenes in Completely Sequenced Genomes

Organism	Genome size (Mb)	No. genes	No. pseudogenes	No. processed pseudogenes	References
R. prowazekii	1.1	834	241	0	Andersson et al. 1998; Ogata et al. 2001
M. leprae	3.3	1604	1116	0	Cole et al. 2001
Y. pestis	4.6	4061	160	0	Parkhill et al. 2001
E. coli K-12 strain	4.6	1100	95	0	Homma et al. 2002
E. coli, O157 strain	5.5	6000	101	0	Homma et al. 2002
S. cerevisiae	12.1	6340	241	0	Harrison et al. 2002a
C. elegans	102.9	20,009	2168	208	Harrison et al. 2001
D. melanogaster	128.3	14,332	110	34	Harrison et al. 2003
A. thaliana	115.4	25,464	>700	??	Arabidopsis Genome Initiative 2000
H. sapiens	3040	22,000–39,000	13,398 (19,929)a	9747	This study
M. musculus	2493	22,011	14,000 (∼10,000)b	(4700)b	Waterston et al. 2002

^aThe number in the parentheses includes pseudogenic fragments

^bUnpublished results by the authors