Expression profiles probe id meaning?

[jeni]

Hello,

What is difference between different probe in the gene expression profiles?
e.g. Gene: IGF1
Probe ID: 211577_s_at, 209540_at, 209542_x_at, 209541_at

I tried to understand it from Wiki, but I would be grateful if somebody could breifly describe it for the beginners.

Thanks in advance.

[dpryan]

They target different regions of the gene (or different transcripts). For example, you'll note that those 4 probes target transcripts with different genbank accession numbers.

[mbblack]

Jeni, if you mean what do the different probe identification schemes mean (the _s_at, _x_at differences), have a look at http://www.affymetrix.com/support/he..._430/faq_8.jsp