[BioC] U133 plus 2.0 probesets, what to keep and what to filter.

[Daren Tan]

>From my understanding of U133 plus 2.0 arrays, all the probesets are not created equally based on the Affy's "Probe Set Extension Nomenclature" from http://www.ohsu.edu/gmsr/amc/amc_technology.html#extensions. I would like to select only those probesets that map uniquely to single gene (can have multiple transcripts of alternative transcripts). 
 
Correct me if I am wrong, I should filter the following:
1) *_s_at
2) *_x_at
3) *_f_at
 
I should keep only these
1) *_a_at
2) *_g_at
3) *_at
 
Should I keep or filter the following ?
1) _i_at
2) _b_at
3) _l_at
4) _r_