Table 1.

Summary of mammalian proteins in the Swiss-Prot and SP-TrEMBL protein databases containing the sequence W-x-x-W^a

Total no. of sequences searched	163,886
Total no. of proteins containing W-x-x-W	12,247
Uniqueb mammalian gene products whose cellular  localization would allow C-mannosylation:	336
1. Receptors	80
2. Channels, transporters	36
3. Hormones, growth factors	39
4.  Enzymes: (proteases, glycanohydrolases, lipases, oxidases, glycosyltransferases, kinases)	70
5. Cell surface and extracellular matrix proteins	42
6. Immunoglobulins, histocompatibility antigens	22
7. Others	47

^a A detailed listing of these proteins is available upon request. 

^b Unique refers to the fact that one organism is counted only in the case of orthologous sequences.