[Genome] dbSNP build 128

[Shan Yang]

Hi,

I have a question here about dbSNP build 128 of hg18 on genome browser. I tried to download the data from the link provided on the browser
ftp://ftp.ncbi.nih.gov/snp/organisms/human_9606/chr_rpts/
(updated on 4/14/08-4/17/08)

Then I looked at the files I got. I randomly picked some locations in the chr_1.gz file, and am surprised to find that majority of the time, the location does not have a snp in browser.
For example, the first 5 lines are like this:

242     2       0       1       1       1       1       NW_927841       1       HsCraAADB02_8   3670230 19193787                0.18    0.24            2       0       1       36      36      C
elera
242     2       0       1       1       1       1       NW_001838573    1       Hs1_WGA29_36    2491270 19115539                0.18    0.24            2       0       1       36      36      H
uRef
242     2       0       1       1       1       1       NT_004610       18      Hs1_4767_36     3693803 20742048                0.18    0.24            2       0       1       36      36      r
eference
538     2       0       1       1       1       1       NW_923572       1       HsCraAADB02_3   2845101 5275775 CHD5,KCNAB2                             0       0       1       36      129     C
elera
538     2       0       1       1       1       1       NW_001838523    1       Hs1_WGA11_36    299275  5309775 CHD5,KCNAB2                             0       0       1       36      129     H
uRef


Among the 5 locations, 19193787, 19115539, 20742048, 5275775, 5309775, only 20742048 has a snp in the GB. 

Am I looking at the wrong file or there is anything wrong here?

Thanks!

Shan




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