Table 1.

Some features of the Arabidopsis chromosomes and proteome

	Number	%
(a) The five DNA molecules
Total length (Mb)	~115
Number of genes	~25,500
Average gene density (kb per gene)	~4.5
Average gene length (kb)	~2
Average peptide length (amino acid)	430
Number of genes with ESTs	15,300	60%
Number of ESTs	105,733
(b) The proteome
Total proteins	~25,500	100
Proteins with similarity to GenBank entries	17,850	70
Unknown proteins	5865	23
Hypothetical proteins	7140	28
Proteins with putative functions	12,495	49
(c) Classification of proteins with putative functions
Cellular metabolism		22.5
Transcription		16.9
Defense		11.5
Signaling		10.4
Growth		11.7
Protein fate		9.9
Intracellular transport		8.3
Transport		4.8
Protein synthesis		4.1

~denotes approximate numbers.