Table 2. Functional categories of proteins detected in S. Typhi membrane preparation.

Classification	Number of proteins
Energy metabolism	134
Unknown function or unclassified	105
Cell envelope	90
Hypothetical proteins	83
Protein synthesis	77
Transport and binding proteins	74
Protein fate	65
Pathogenesis/virulence/cellular processes	59
Central intermediary metabolism	42
Regulatory functions	39
DNA metabolism	38
Amino acid biosynthesis	30
Biosynthesis of cofactors, prosthetic groups, and carriers	28
Purines, pyrimidines, nucleosides, and nucleotides	25
Transcription	19
Fatty acid and phospholipid metabolism	18
Mobile and extrachromosomal element functions	4
Viral functions	4
Total	934