Hello everyone.

I'm looking for compare affymetrix probe set expression from
the different probe cell positions on gene. I downloaded the affymetrix
annotation file about HG U133 plus 2 microarray (HG 18 and HG 17) and I
converted them into HG 19 model with Lift Over tool.
The problem is the folowing: when I compare result with data provided by
affymetrix (NetAffx tool), I obtain some times the same data (i.e. probe set
1007_s_at) and sometimes conflicting data (i.e. probe set 1053_at).
Furthermore, Genome browser seems to generaly agree whith affymetrix data.
I would like to understand why I founded these diferencies and which are the
best data to use.
I may did something wrong and someone may correct me in my protocol
Thanks for your attention
Best regards
Alexandre
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