[BioC] RMA identical expression values

[Alessandra Luchini]

Dear All,
using affy package latest release I noticed something odd with rma 
function. Performing statistical tests on expression levels I found few 
genes having exactly the same value, for example like these,

202117_at         10.124479       10.124479       10.124479       10.124479 
       10.124479
207451_at          5.539533        5.539533        5.539533        5.539533 
        5.539533
207481_at          4.135484        4.135484        4.135484        4.135484 
        4.135484
207494_s_at        7.522122        7.522122        7.522122        7.522122 
        7.522122
207576_x_at        5.764695        5.764695        5.764695        5.764695 
        5.764695
207588_at          3.613649        3.613649        3.613649        3.613649 
        3.613649

I was wondering what's the meaning of this result.
If anybody have any experience on it I would thank some help.

Bye
Ale

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