[BioC] How to filter up- and down-regulated genes?

[Vitalina Komashko]

Hello!
I analize Affymetrix chips. There are two groups of transgenic and nontransgenic mice with 3 samples in each group. I normalised my data using rma, and calculated an adjusted p-value using multtest package. I have found out that there are about 64 differentially expressed genes between these two groups (alpha=0.01) (I used Bonferroni procedure). 
Next question is which of these genes are up- and down-regulated? How could I find out it?
Thank you very much!
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